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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单项选择题
The twins usually look __________ So we often mistake them __________ each other.
A．same.., for
B．the same.., with
C．the same.., for
单项选择题
The girl was heard __________ in the next room.
A．sing
B．to sing
C．sang
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