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：

瑪麗的考試分?jǐn)?shù)在班內(nèi)最高，由此推斷，她一定是努力學(xué)習(xí)了，用must have studied。


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