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
Digital recording has made()a significantly wider dynamic range, in recorded music.

A. for the possibility
B. the possibility is
C. it is possible
D. possible
单项选择题
I told him that I would()him to act for me while I was away from office.

A. identify
B. authorize
C. rationalize
D. justify
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