问题补充：
You can use a large plastic bottle, cut off, as a pot to grow young plants in.
A. the top is
B. the top of which
C. whose top
D. with its top
答案：
A. the top is
B. the top of which
C. whose top
(答案→)D. with its top
解析：分析句子结构可知，中间是个补充说明部分，可有以下表达方式：非限定性定语从句the top of which is cut off；whose top is cut off；介词with的复合结构with its top cut off。
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