单项选择题

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

A．if
B．as
C．for
D．before
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单项选择题
--Shall I buy this toy for little Charlie-- ______ . He might already have it.
A．You should
B．You'd better not
C．No problem
D．You can't do that
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