单项选择题

“What’s the matter with that picture on the wall”“It needs（）”

A．straightening
B．to be straightening
C．straightened
D．straighten

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单项选择题
Gunpowder was discovered in the twelfth century, but____.
A．man did not put it to use in war two hundred years later
B．until two centuries more it was used in war
C．not used in warfare until two hundred years later
D．in warfare did not use it two hundred years afterwards
单项选择题
During the rush hours, a policeman directs traffic at the intersection, and ____there have been no accidents.
A．as of now
B．to the present
C．up until currently
D．so far
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