单项选择题

What are the essential differences ______ selling and marketing

A. between
B. from
C. among
D. for
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How much does it ______ to take the online training course
A. cost
B. give
C. pay
D. spend
单项选择题
Before ______ for the job, you will be required to take a language test.
A. apply
B. applying
C. applied
D. to apply
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