单项选择题

"The stove is still on.""It ______ on. I had turned it off myself and I checked it twice."

A．can't be
B．mustn't be
C．couldn't have been
D．mustn't have been
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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
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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