单项选择题

"I bought this shirt for $ 35 yesterday.""It's on sale today for only 29. You should have waited.""Oh really But how ______.I know"

A．would
B．can
C．did
D．do
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单项选择题
Mr. White works with a chemicals import export company, but he for the industrial fair, since he is on leave.
A．has worked
B．works
C．has been working
D．is working
单项选择题
They were pushed into battle ______
A．unprepared
B．unpreparedly
C．not prepared it
D．without preparing it
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