单项选择题

The police caught him ______ over the wall of the factory.

A．climbing
B．climbed
C．climb
D．climbs
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单项选择题
I didn' t hear the sound, so I ______ asleep.
A．must be
B．must have been
C．should be
D．should have been
单项选择题
I didn' t go with them to the beach yesterday. But I do wish I ______ there.
A．had been
B．have been
C．was
D．am
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