The plants must________ every three days, or they will fail to grow.
The plants must________ every three days, or they will fail to grow.
A. water B. watering C. be watered D. watered
【答案】C
【解析】句意:这些植物必须每三天浇一次水,否则它们就不能生长。考查被动语态。must一定,情态动词后接原形动词。plants是动词water(浇水)的受动者,需用被动语态,即“be+过去分词”结构。根据句意结构和语境,可知选C。
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