David would certainly have attended the important conference, if he ______.

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问题 David would certainly have attended the important conference, if he ______.

选项 A、was invited
B、had been invited
C、is to be invited
D、has been invited

答案B

解析 本题所表示的是对过去发生的事件的虚拟。在这种情况下,if引导的从句通常是使用过去完成时来表示。
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