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________ I can’t understand is ________ he wants to change his mind.
A．that; thatB．what; whyC．which; whatD．what; 不填
B
考查名詞性從句。What I can’t understand是主語從句，what引導(dǎo)主語從句并在句中作為understand的賓語。Why he wants to change his mind是表語從句。句意：我不能理解的是為什么他不想改變想法。
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