单项选择题

The girl was heard __________ in the next room.

A．sing
B．to sing
C．sang
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单项选择题
Tom __________ to work long hours yesterday.
A．found
B．was looked
C．was seen
单项选择题
The machine doesn't work well. Why not __________ it
A．have.., repair
B．to have.., repair
C．have.., repaired
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