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【题目】Thousands of trees must _______ every year.
A.plant
B.be planted
C.have been planted
D.have planted

【答案】B
【解析】句意:成千上万的树每年必须被种植。must是情态动词,其后必须跟动词原形。A种植,主动形式;B被种植,被动形式;C已经被种植,与every year矛盾;D已经种植,与every year矛盾。所以正确答案是B。

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