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
Scarcely had her husband arrived home ______ his wife started complaining.
A．when
B．that
C．than
D．and
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