【題目】If he had known he was building his own house，he all of it so differently.

A. would do B. would have done

C. could do D. must have done

【答案】B

【解析】根據(jù)“If he had known”可知，本句是對過去的虛擬，因此主句中謂語動(dòng)詞需用would have done結(jié)構(gòu)。must have done表示“一定做過”，是過去事情的肯定推測。

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