单项选择题

In recent years special attention has been paid ______ developing the students' productive skills.

A. over
B. to

C. on
D. in
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单项选择题
It is hard to avoid mistakes. ______ you correct them carefully, it will be all right.
A. In the case
B. As long as
C. Although
D. Despite
单项选择题
English serves as a common tongue in countries ______ people speak many different languages.
A. which
B. why

C. where
D. that
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