问题
选择题
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
答案
答案：D
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