单项选择题

I'd have bought the bigger model if I ______ afford it.

A．could
B．had been able to
C．had
D．would be able to
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单项选择题
It's high time we ______ him a registered letter.
A．send
B．sent
C．has sent
D．had sent
单项选择题
The fishing boat that has been tied up at the pier for three days ______ finally on its way this morning.
A．was
B．were
C．is
D．are
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