单项选择题

It's high time we ______ him a registered letter.

A．send
B．sent
C．has sent
D．had sent
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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
单项选择题
The police have caught the suspected thief and he's ______ arrest.
A．in
B．into
C．under
D．with
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