搜搜做题作业网完成以下句子,用had to或must have been填空.
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完成以下句子,用had to或must have been填空.
Example：
He is very tired because he had to get up early this morning.
He didn't get up early this morning.He must have been tired.
1 He didn't come to work yesterday.He ______ ill.
2 He didn't come to the office this morning.He ______ stay at home.3 I don't think she was Austrian.She ______German.
4 I lost my pen so I ______ buy a new one.
5 He forgot his case so he ______ return home.
6 She didn't hear the phone.She ______ sleeping.
Example：
He is very tired because he had to get up early this morning.
He didn't get up early this morning.He must have been tired.
1 He didn't come to work yesterday.He ______ ill.
2 He didn't come to the office this morning.He ______ stay at home.3 I don't think she was Austrian.She ______German.
4 I lost my pen so I ______ buy a new one.
5 He forgot his case so he ______ return home.
6 She didn't hear the phone.She ______ sleeping.
Example：
He is very tired because he had to get up early this morning.
He didn't get up early this morning.He must have been tired.
1 He didn't come to work yesterday.He【must have been】 ill.
2 He didn't come to the office this morning.He【had to】stay at home.
3 I don't think she was Austrian.She 【must have been】German.
4 I lost my pen so I 【had to】 buy a new one.
5 He forgot his case so he 【had to】 return home.
6 She didn't hear the phone.She 【must have been】sleeping.
再问： 为什么这么填？？
再答： had to “不得不”，后接动词原形must have been "肯定..." 表示一种肯定的推测，后接v-ing，名词或者形容词均可！
通过词义和后接词两种方法都可判定。
He is very tired because he had to get up early this morning.
He didn't get up early this morning.He must have been tired.
1 He didn't come to work yesterday.He【must have been】 ill.
2 He didn't come to the office this morning.He【had to】stay at home.
3 I don't think she was Austrian.She 【must have been】German.
4 I lost my pen so I 【had to】 buy a new one.
5 He forgot his case so he 【had to】 return home.
6 She didn't hear the phone.She 【must have been】sleeping.
再问： 为什么这么填？？
再答： had to “不得不”，后接动词原形must have been "肯定..." 表示一种肯定的推测，后接v-ing，名词或者形容词均可！
通过词义和后接词两种方法都可判定。
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