theygrowtheymakesurethatwhatisleftinthegrounda...

問題詳情：

          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

【回答】

C

知識點：連詞

題型：選擇題