11.C被动语态（树是被种）
12.B光比声音传得快是一张自然现象,像这种客观事实或真理的话,要用一般现在时.
13.A,had是延续性动词.而borrow是短暂性动词.
14.D,也是被动语态,而且去年要用过去时.
15.D,用完成时表示这几年以来都没看到她.
英语选择题11-1511.-Do you often plant trees in spring?-Yes.Many t
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