Willpower is a kind of quality, ________ is ________ it takes to do anything well.
A．what; whichB．what; what
C．which; whichD．which; what
D
D　句意：意志力是一種品質(zhì)，是做好任何事情所需要的。“________is________it takes to do anything well”為非限制性定語從句，先行詞為willpower，先行詞在定語從句中作主語，故用which引導(dǎo)；“________is________it takes to do anything well”這一定語從句中又含一表語從句，即“________it takes to do anything well”，該表語從句缺少賓語(作takes的賓語)，表示“事物”且語境中并無選擇含義，故用what引導(dǎo)。
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