单项选择题

Just as there are occupations that require college or even higher degrees, so too are there occupations ______ technical training is necessary.

A. for which
B. in which
C. to which
D. at which
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She was complaining that the doctor was ______ too much for the treatment he was giving her.
A. expending
B. offering
C. costing
D. charging
单项选择题
Doing your homework is a sure way to improve your test scores, and this is especially true ______ it comes to classroom tests.
A. when
B. since
C. before
D. after
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