【題目】He _____ the tree as often as possible.

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

【答案】C

【解析】句意：他必須盡可能經(jīng)常給那棵樹澆水。根據(jù)often可知此處用一般現(xiàn)在時，故排除AD兩項，主語he是第三人稱，與謂語water之間是主動關系，故謂語用第三人稱單數(shù)waters，故排除B項。故選C。

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