单项选择题

To drive a car safely, it is ______ good brakes.

A. essential with
B. essential having
C. essential to have
D. essential have
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单项选择题
The earnings of women are well below that of men ______ educational differences that are diminishing between the two sexes.
A. although
B. though
C. despite of
D. in spite of
单项选择题
Though it was late in the night, ______ he continued to work vigorously.
A. but
B. yet
C. and
D. that
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