In some places trees ______ to stop the wind from blowing the earth away.
A. will plant  B. planted  C. are planted
C
考查時(shí)態(tài)及語態(tài),句意:在一些地方,一些樹被種植來阻止風(fēng)把土壤帶走。根據(jù)句意所以應(yīng)用被動(dòng)語態(tài),選C。
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