单项选择题

He set up in business ______ his own and was very successful.

A. in
B. of
C. on
D. by
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单项选择题
We will be losing money this year unless that new economic plan of yours ______. miracle.
A. is working
B. works
C. will be working
D. worked
单项选择题
Our teacher recommended that we ______ as attentive as possible when we visit the museum.
A. are
B. shall be
C. be
D. were
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