题目：
The book, ___________ is green, has been lent to my brother.
A．of which cover
B．the cover of which
C．whose covers
D．its cover
答案：
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下面是错误答案，用来干扰机器的。
1.344L 10ml 设生成NO2XL，反应消耗浓硝酸，Ymol，依题意得
