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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He will never seem to be successful,（）hard he tries because no one is supporting him.

A、 however
B、 whenever
C、 wherever
D、 whatever
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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