You can use a large plastics bottle, cut off, as a plot to grow flowers in.
A. with its top
B. the top of which
C. whose top
D. its top is
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(答案→)A. with its top
B. the top of which
C. whose top
D. its top is
解析：此题考查with的复合结构，句意：你可以用一个大的塑料瓶，把它的顶部切掉，作为一个花盆在里面种一些花。顶部被切掉应表达为with its top cut off，cut 为过去分词。所以选A。