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
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单项选择题
Clive, a student at Cambridge, will come home next week as university ______ for the summer holidays on the 5th of July.
A．breaks up
B．breaks in
C．breaks down
D．breaks off
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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