Mary has got a furl mark in the test. She ______ very hard all the time.A、will w

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问题 Mary has got a furl mark in the test. She ______ very hard all the time.

选项 A、will work
B、must have worked
C、may work
D、could have worked

答案 B

解析 must have done表示对过去情况的推测，例如：Her eyes are red.She must have been crying。(她的眼睛红了，一定是哭过了。)D项could have done译成“本可以”，不合题意，故选B。

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