Question

【題目】The plants ________ every three days, or they will fail to grow.

A.must waterB.may waterC.must be wateredD.may be watered

Answer 1

【答案】C

【解析】

考查含情態(tài)動詞的被動語態(tài)。句意為：這些植物必須三天澆一次水，否則就不能生長。根據(jù)句意，應(yīng)用含情態(tài)動詞must的被動語態(tài)。故選C。