The plants must________ every three days, or they will fail to grow.

A. water B. watering C. be watered D. watered

C 【解析】句意：這些植物必須每三天澆一次水，否則它們就不能生長(zhǎng)�？疾楸粍�(dòng)語(yǔ)態(tài)。must一定，情態(tài)動(dòng)詞后接原形動(dòng)詞。plants是動(dòng)詞water（澆水）的受動(dòng)者，需用被動(dòng)語(yǔ)態(tài)，即“be+過(guò)去分詞”結(jié)構(gòu)。根據(jù)句意結(jié)構(gòu)和語(yǔ)境，可知選C。
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