单项选择题

The ______ of AIDS has led to an expansion in research seeking a cure.

A. innovation
B. selection
C. proliferation
D. conviction
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单项选择题
Although ______ Chinese, Bush attended the course.
A. was knowing
B. he is knowing
C. having a knowledge of
D. knows
单项选择题
______ the sense of someone watching him, Joey would take a shower right now in this beautiful river.
A. Despite
B. Except
C. But for
D. Except for
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