单项选择题

— "They have done a good job."

A. So they have done
B. So they have
C. So have they

D. So is it
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I love performing on stage, as most actors do, because the audience ______ right there and the response is so honest and immediate.
A. is
B. was
C. were
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单项选择题
E-mail, as well as telephones, ______ an important part in daily communication.
A. is playing
B. have played
C. are playing
D. play
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