题目内容
Mary's score on the test is the highest in her class; she ________ have studied very hard.
[ ]
A．may
B．should
C．must
D．ought to
答案：C
解析：
解析：
|
第一句话中“得了最高分”是“努力学习”的结果，故用 must have done表示对过去情况的肯定判断。 |
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—Mary’s score on the test is the highest in her class.
—Really? She have studied very hard.
| A．may | B．ought to | C．must | D．should |