had been puzzled over the problem for over an hour without a
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had been puzzled over the problem for over an hour without any result
I had been puzzled over the problem for over an hour without any result,________ all at once the solution flashed across my mind.
A while
B when
C then
D as
应该选B.为什么?各个选项都讲一遍为什么不对.
I had been puzzled over the problem for over an hour without any result,________ all at once the solution flashed across my mind.
A while
B when
C then
D as
应该选B.为什么?各个选项都讲一遍为什么不对.
![had been puzzled over the problem for over an hour without a](/uploads/image/z/17986639-31-9.jpg?t=had+been+puzzled+over+the+problem+for+over+an+hour+without+a)
我已经对这个难题思考了一个小时还是没有结果,正在这时答案有我的头脑中显现!
when翻译为正在这时(有突然发生的意思),这是它的特殊用法!
while ,as充当时间状语时只能表示一边一边故代入句子明显不和理!
then那时代入句子,得到翻译结果:
我已经对这个难题思考了一个小时还是没有结果,那时答案有我的头脑中显现!(那时答案已经有了,还用思考一个小时吗!)
有这里when的用法如下:
表示前面的叙述所没有提到过的信息.它总是对所描述的事件予以引人注目的强调,意为“这时;突然”;当位于句末的分句具有引种用法时,大致有以下三种情况:
A.when 分句前面的分句使用过去进行时.
如:( 1 ) He was still smiling when the door opened and his wife came in.他正笑着的时候,门突然开了,他妻子走了进来.
( 2 ) I was thinking of this when I heard my name called.我正想着这件事时,突然听到有人叫我的名字.
B.when 分句前面的分句使用 was (were) about to,was (were) on the point 等.
如:( 1 ) We were about to start when it began to rain.我们刚要出发就开始下雨了.
( 2 ) He was on the point of leaving when someone knocked at the door.他刚要走就有人敲门.
C.when 分句之前的分句用过去完成时,其中 sb had hardly / scarcely /barely … when 已成为固定词组.如:
( 1 ) We had hardly fallen asleep when the bell rang.我们刚刚入睡,铃声就响了起来.
( 2 ) He had scarcely arrived when he had to leave again.他刚刚到达就又要离开了.
when翻译为正在这时(有突然发生的意思),这是它的特殊用法!
while ,as充当时间状语时只能表示一边一边故代入句子明显不和理!
then那时代入句子,得到翻译结果:
我已经对这个难题思考了一个小时还是没有结果,那时答案有我的头脑中显现!(那时答案已经有了,还用思考一个小时吗!)
有这里when的用法如下:
表示前面的叙述所没有提到过的信息.它总是对所描述的事件予以引人注目的强调,意为“这时;突然”;当位于句末的分句具有引种用法时,大致有以下三种情况:
A.when 分句前面的分句使用过去进行时.
如:( 1 ) He was still smiling when the door opened and his wife came in.他正笑着的时候,门突然开了,他妻子走了进来.
( 2 ) I was thinking of this when I heard my name called.我正想着这件事时,突然听到有人叫我的名字.
B.when 分句前面的分句使用 was (were) about to,was (were) on the point 等.
如:( 1 ) We were about to start when it began to rain.我们刚要出发就开始下雨了.
( 2 ) He was on the point of leaving when someone knocked at the door.他刚要走就有人敲门.
C.when 分句之前的分句用过去完成时,其中 sb had hardly / scarcely /barely … when 已成为固定词组.如:
( 1 ) We had hardly fallen asleep when the bell rang.我们刚刚入睡,铃声就响了起来.
( 2 ) He had scarcely arrived when he had to leave again.他刚刚到达就又要离开了.
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