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
Only when he works harder（）the exam.

A．Tom can pass
B．Tom will pass
C．can Tom pass
D．was Tom to pass
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
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