单项选择题

This is unlikely I admit, but, ______, virtually nothing in the Known World could withstand it.

A. if it happens

B. should it happen
C. will it happen

D. if it will happen
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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 he acquired the use of the ______.
A. latter
B. latest
C. later
D. last
单项选择题
A. adopted B. incorporated C. administered D. established
A. adopted B. incorporated
C. administered D. established
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