2. 职称英语
  3. They ______ because the light’s on!A、must have gone outB、can’t have gone outC、

They ______ because the light’s on!A、must have gone outB、can’t have gone outC、

游客2023-07-17  94
问题 They ______ because the light’s on!
选项 A、must have gone out
B、can’t have gone out
C、mustn’t have gone out
D、can’t go out
答案 B
解析 此题考查情态动词的用法。表示推测时，肯定形式用must，否定形式用can’t一般表示对事实有根据的否定推测。如：He can’t be in the house；he went out half an hour ago．他不可能在家，半小时前他就出去了。can后接动词的完成时态表示某人可能已经做了某事或某事已发生，或者由虚拟语气延伸而表示“能而未”。如：Where can he have gone?他能去哪儿了呢?Many women could have had very good positions
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