【題目】We don’t know they did it.

A. which B. who C. what D. how

【答案】D

【解析】

考查名詞從句的引導詞。我們不知道他們是怎么做到的。

分析從句可知，從句中有主謂賓。所以只缺狀語，而A、B、C三項都是代詞，不能作狀語，只有D項是副詞，可以作狀語，故選D項。

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