单项选择题

They ______ such a big van ______ the price of gas would skyrocket.

A．would have bought; if they knew
B．wouldn't have bought; had they known
C．wouldn't have bought; if had they known
D．wouldn't have bought; did they know
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单项选择题
If the whole operation ______ beforehand, a great deal of time and money would have been lost.
A．was not planned
B．has not been planned
C．had not been planned
D．were not planned
单项选择题
I tried very hard to persuade him to join our group but I met with flat ______.
A．disapproval
B．rejection
C．refusal
D．decline
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