【題目】The trees must ________ three times a week.

A. water B. watering

C. be watered D. waters

【答案】C

【解析】

句意:那些樹必須一周被澆三次水。結合句意,主語the trees與謂語water之間是被動關系,故用被動語態(tài),位于情態(tài)動詞must后,故用動詞原形be watered。故選C。

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