I have no idea ______ it is that makes him puzzled.
A．howB．whatC． whyD．which
B
詞義辨析。A. 怎樣  B. 什么C.為什么  D.哪一個(gè)。句意：我不知道是什么讓他迷惑不解。從句缺少主語，故選B。
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