3．You ______ very fast if you went from New York to Boston in six hours．（　�。�
A．should driveB．would have driven
C．may driveD．must have driven

分析 如果你在六個小時內(nèi)從紐約去波士頓，你開車一定很快．

解答 答案：D
句意表達的是對過去事實的肯定推測，要用情態(tài)動詞加完成時態(tài)來構成；would加完成時態(tài)表示的是虛擬，不是推測．故選D．

點評 在表示建議，命令，要求的名詞性從句中，從句要用should加動詞原形來構成虛擬，should可以省略．學習時要注意區(qū)分條件虛擬句．

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