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
The country's chief exports are coal, cars and cotton goods, cars ______ the most important of these.
A．have been
B．are
C．being
D．are being
单项选择题
Robert says he bought these books in a ______.
A．disposal
B．sale
C．production
D．reduction
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