2. 外语
  3. Mary has got a full mark in the test. She ______ very hard all these days.

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

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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、could have worked
D、must have worked
答案D
解析 句意：玛丽在考试中得了满分，这些日子她一定非常用功。用must have worked表示肯定地推测，符合句意。could have worked仅表示一种可能性，与前句“她得了满分”衔接不上来。
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