Many incurable diseases such as cancer and prostatitis become commoner ______ we get older.

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问题  Many incurable diseases such as cancer and prostatitis become commoner ______ we get older.

选项 A、if
B、as
C、for
D、before

答案B

解析 由as引导的时间状语从句意思是“随着……,当……的时候”,表示伴随状态。注意:get older和得病这两个动作同时存在,但没有因果或条件关系,因此if,for和before都不合适。
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