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But______ they grow,they make sure that what is left in the

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But______ they grow,they make sure that what is left in the ground after ha
But______ they grow,they make sure that what is left in the ground after harvesting______ a natural fertilizer for the next year’s crop.
A.whatever; become B.whichever; become
C.whatever; becomes D.whichever; becomes
答案:C
第一空whatever表示“无论什么”,第二空,主语是what引导的名词性从句,所以谓语动词用单数形式.