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Mary has got a full mark in the test. She ______ very hard all these days.A、wil
Mary has got a full mark in the test. She ______ very hard all these days.A、wil
游客
2023-09-29
24
管理
问题
Mary has got a full mark in the test. She ______ very hard all these days.
选项
A、will work
B、may work
C、must have worked
D、could have worked
答案
C
解析
本题考查的是情态动词的用法。will用于一般将来时,表示“将要……”,不合题意。 may表示“可能,也许”,如:It may rain today.(今天可能下雨。)表示推测时,may的语气较轻,不合题意。C选项must have done结构表示“一定做过……”,是对过去发生的事情最肯定的推测,如: The ground is wet.It must have rained last night.D选项中的could have done结构也表示推测,但语气比must have done轻,语气显得不太肯定,所以此题选择C。
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