He had worked so hard. He _______ in the exams.(本题5.0分)<br> A、 must have<br> B、 would have<br> C、 could have failed <br> D、 should not have failed

He had worked so hard. He _______ in the exams.(本题5.0分)
A、 must have
B、 would have
C、 could have failed
D、 should not have failed

出自：延安大学-大学英语Ⅲ

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