Many leaves of trees_____ in autumn.A is falling B are falling C are fallen D fell

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Many leaves of trees_____ in autumn.A is falling B are falling C are fallen D fell
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Many leaves of trees_____ in autumn.A is falling B are falling C are fallen D fell
Many leaves of trees_____ in autumn.
A is falling B are falling C are fallen D fell

Many leaves of trees_____ in autumn.A is falling B are falling C are fallen D fell
B.
leave 树叶,可数名词,并且前面加了many,所以后面的系动词用复数,A排除.树叶应该是主动落下而不是被动的,C是被动句,不能选.而树叶是在每个秋天都会落,属于常识,不能用过去式,排除D.
句意,在秋天,许多树叶都飘落了.

B are falling

选择是B 意思在秋天树上的叶子都落了

选B ,leaves是复数,排除A,落叶是主动用falling。

没有语境很难说哪个比较好,个人觉得B和D都可以用