单项选择题

It may be many years () the situation in that area improves.

A. before
B. after
C. since
D. when

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单项选择题
Often () not to be late for class.

A. the teacher asked tom
B. the teacher asks Tom
C. the teacher have asked Tom
D. did the teacher ask Tom
单项选择题
In 1959 we produced a hundred-fold ()steel as we did in 1949

A. more than
B. as much
C. as many
D. doubled
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