单项选择题

The current general slackness of the market has prevented us from ______ new orders with you.

A．placing.
B．putting
C．arranging
D．providing
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单项选择题
It was only after some progress ______ in the use and development of electric current that men began to realize the importance and possibilities of magnetism.
A．was made
B．would have been made
C．has been made
D．had been made
单项选择题
______ for my illness, I would have lent him a helping hand.
A．Not being
B．Had it not been
C．Without being
D．Not having been
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