______ 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; becomeB．Whichever; becomeC．Whatever; becomesD．Whichever; becomes
C

試題分析：考查狀語(yǔ)從句和主謂一致。句意：無(wú)論他們種什么，他們確信在了收獲后留在地里的都會(huì)成為為了來年的收成的一中天然的肥料。根據(jù)：whichever無(wú)論哪一個(gè)（有固定范圍），而本句沒有范圍，所以排除B和D，第二個(gè)空根據(jù)主語(yǔ)是what從句，謂語(yǔ)動(dòng)詞有表語(yǔ)而定，表語(yǔ)a natural fertilizer f，單數(shù)，所以一個(gè)是becomes ,所以C正確。
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