2. 职称英语
  3. Mary has got a full mark in the test She ______ very hard all these days.A、will

Mary has got a full mark in the test She ______ very hard all these days.A、will

游客2023-09-20  28
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。must have done表示“一定做过……”，是对过去发生的事情最为肯定的推测，符合句义，故选C。选项A中的will用于一般将来时，表示“将要……”，不合题意。选项B中的may表示“可能，也许”，但表示推测时，语气较轻，不合题意。D选项中的could have done结构也表示推测，但语气比must have done轻。所以也排除选项D。
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