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题目内容
（延安大学-大学英语Ⅲ）
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
A、 must have
B、 would have
C、 could have failed
D、 should not have failed
参考答案
