问题
选择题
Man must keep in mind that it will be years ________ the earth recovers from the damage he makes to it.[ ]
A．when
B．before
C．since
D．until
答案
答案：B
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Man must keep in mind that it will be years ________ the earth recovers from the damage he makes to it.[ ]
A．when
B．before
C．since
D．until
答案：B