单项选择题

The first two, stages in the development of civilized man were probably the invention of weapons and the discovery of fire, although nobody knows exactly when man acquired the use of the（）

A. latter
B. latest
C. later
D. last

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单项选择题
（41）（）

A. should
B. ought
C. like
D. have to
单项选择题
It will take us twenty minutes to get to the railway station,（）traffic delays.

A. acknowledging
B. affording
C. allowing for
D. accounting for
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