单项选择题

Air is composed of ______ gas including hydrogen, oxygen and carbon dioxide.

A. varied
B. variant
C. variable
D. various
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单项选择题
After ______ for the job, you will be required to take a language test.
A. being interviewed
B. interviewed
C. interviewing
D. having interviewed
单项选择题
Her address made a great impression ______ the audience.
A. at
B. of
C. in
D. on
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