单项选择题

In order not to be disturbed, I spent three hours ______ in my study.

A．locking
B．locked
C．to lock
D．being locked
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单项选择题
60% of the population of the town ______ workers; things are different now.
A．is
B．are
C．was
D．were
单项选择题
Do you have any clothes to ______ , Tom mother asked.
A．wash
B．be washed
C．washing
D．washed
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