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It would be a good idea to use a plastic bottle, ___cut off, as a container to grow young plants in.

A. of which the top      B. the top is       C. the top of which       D. with its top

D


解析:

此题是独立主格结构,如果题干改为 ____is cut off,答案则为A或C

【标签】独立主格结构

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