填空题 Your math instructor {{U}}would have been{{/U}} happy to give you a makeup examination {{U}}had you gone{{/U}} and {{U}}explained{{/U}} that your parents {{U}}had been{{/U}} ill at the time. A. would have been B. had you gone C. explained D. had been
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【正确答案】 1、D，改had been为were。    
【答案解析】[试题分析] 本题考查对于时态的掌握。 [详细解答] 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。