.I didn’t see Mr White at the meeting ._____ he come, he would have given a lecture.
A．WouldB．DidC．ShouldD．Had
D
根據(jù)語境可知, 后一句是一個表示與過去事實相反的假設。if條件從句用過去完成時had done主句用would have+ 過去分詞, 又知if條件句中如有were, should, had，可以省去if，并使用倒裝語序, 即were, should, had+主語+謂語動詞。故答案為D。
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