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题目内容
（郑州工程技术学院-大学英语1）
He didn.t pass the final examination. He ______ it.
(A)must have prepared for
(B)ought to prepare for
(C)ought to have prepared for
(D)ought to prepare for
(A)must have prepared for
(B)ought to prepare for
(C)ought to have prepared for
(D)ought to prepare for
参考答案