单项选择题

Great () the difficulties are, we must do our best to succeed.

A. while
B. as
C. although
D. however

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单项选择题
It’s high time () about the traffic problems.

A. something was done
B. something is done
C. anything will be done
D. nothing to be done
单项选择题
Private cars have made the traffic problems ()

A. the worse than before
B. worse than ever before
C. more bad as before
D. more bad than it was
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