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

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

    【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

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