Your math instructor (would have been) happy to give you a makeup examination (had you gone) and (explained) that your parents (

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问题 Your math instructor (would have been) happy to give you a makeup examination (had you gone) and (explained) that your parents (had been) ill at the time.

选项 A、would have been
B、had you gone
C、explained
D、had been

答案D

解析 改had been为were。本题考查对于时态的掌握。虽然题目句子整体上看属于虚拟语气句,但"你父母生病"并非虚拟,而且由时间状语at the time可知,此处应该用一般过去时。
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