They were surprised that a four-year-old boy should work out

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They were surprised that a four-year-old boy should work out such a difficult problem ____ they themselves couldn’t. A.once B.then C.while D.if
为什么选这个?

C.while 这个句子的翻译：他们对于一个四岁的男孩能够做出这么难的题而感到惊讶,（当）他们自己不能做到的时候. 通过理解句意,A一次,B然后都不可能,排除…………由于句子是过去式,D如果也不对………故选C,当…的时候
选C因为:A一旦 B表并连,因果 D表条件. 我们惊讶于四岁小男孩能做出这样难得题,然而他们本不应该会做的.while在此处是然而的意思,表转折,此处就算有BUT选项也不能选,因为两个独立成句之间的BUT连接必须有逗号连接.

They were surprised that a four-year-old boy should work out they were surprised that a child should work out the problem a four-year-old boy可以说成a four-year old boy 请问:是a four years old boy?还是a four year old boy?正确 We were surprised that he could _____ work out the hard prob They were children.Four and five-year-olds,为什么old加s 帮忙翻译下my four year-old boy tried to start a mosh pit during n 英语：1.they were surprised to find that was a lovely cat.he fo road,surprised,a,that,they,crossed,snake,were,the.（连词成句）求帮忙连词成句英语工具road,surprised,a,that,they,crossed,snake,were,the 翻译 They were surprised that there was a cake on the table. Ann__Tom when they were both twenty-four years old.A:get mar