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【题目】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】

考查含情态动词的被动语态。句意为:这些植物必须三天浇一次水,否则就不能生长。根据句意,应用含情态动词must的被动语态。故选C

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