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外语
The classroom is empty, so the students______have gone to the laboratory.
The classroom is empty, so the students______have gone to the laboratory.
admin
2017-02-28
45
问题
The classroom is empty, so the students______have gone to the laboratory.
选项
A、ought to
B、must
C、should
D、could
答案
B
解析
本题考查情态动词的用法。“情态动词+have done”表示对过去行为的推测。根据句意,must have done符合题意,是对过去行为的肯定推测。ought to/should have done sth.意为“过去应该做某事却未做”;could have done sth.用于虚拟语气,意为“本来能够做某事却未做”。
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本试题收录于:
大学英语三级B级题库大学英语三级分类
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大学英语三级B级
大学英语三级
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