问题
单项选择题
No plant can possibly exist on the moon because there is no water,______is indispensable to life.
A．that
B．which
C．it
D．of which
答案
参考答案：B
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No plant can possibly exist on the moon because there is no water,______is indispensable to life.
A．that
B．which
C．it
D．of which
参考答案：B