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外语
He ______ the 9:00 train because he didn’t leave home until 9:10.
He ______ the 9:00 train because he didn’t leave home until 9:10.
admin
2010-04-24
37
问题
He ______ the 9:00 train because he didn’t leave home until 9:10.
选项
A、couldn’t have caught
B、shouldn’t have caught
C、ought to have caught
D、must not have caught
答案
A
解析
本题考察情态动词表示猜测的用法。couldn’t have done表示对过去发生的事进行否定猜测,意为“不可能……”。本题意为“他不可能赶上9:00的火车,因为他 9:10才离开家”。 shouldn’t have done,本不应该做某事;ought to have done,本应该做某事;D项不正确。要注意情态动词表示猜测时,can只能用于否定形式而must只能用于肯定形式。
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专业英语四级
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