2. 职称英语
  3. 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  59
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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