单项选择题

It will be a great advantage to be able to speak a foreign language, especially if you are ______ business.

A. to
B. with
C. on
D. in
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单项选择题
We support the view that poor management will ______ business failure.
A. break up
B. take in
C. lead to
D. put off
单项选择题
I have no idea what Mary _________ at this time tomorrow.
A. will be doing
B. is doing
C. will do
D. does
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