单项选择题

With the worldwide oil crisis, the price of oil has been raised ______ 15%.

A. about
B. with
C. of
D. by
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It is no longer a problem ______ the poor children in this district can go to school.
A. that
B. whether
C. so
D. because
单项选择题
Of all the applicants, ______ do you think is fit for the position
A. who
B. whoever
C. whomever
D. whichever
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