【題目】The young trees ______ every three days.
A.are watered
B.were watered
C.are watering
D.have watered

【答案】A
【解析】句意：這些小樹(shù)每三天被澆一次水。主語(yǔ)trees與water之間構(gòu)成動(dòng)賓關(guān)系；every three days可知時(shí)態(tài)為一般現(xiàn)在時(shí)。故選A。

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