Many incurable diseases such as cancer and prostatitis become commoner ______ w

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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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【B1】[br]【B15】A、becameB、becomingC、becomeD、tobecomeC此题考查become的动词变化形式。becom