单项选择题

In our English class, our teacher pays great attention ______ conversational skills.

A．on
B．at
C．for
D．to
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单项选择题
______ the cause, they were able to propose to a remedy.
A．Found
B．Having found
C．Have found
D．Having been found
单项选择题
The students ______ their papers by the end of this month.
A．have finished
B．will be finishing
C．will have finished
D．have been finishing
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