单项选择题

It is vital that enough money ______ to fund the project.

A．be collected
B．must be collected
C．is collected
D．can be collected
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单项选择题
I've already told you that I'm going to buy it, ______.
A．no matter how it costs
B．however does it costs much
C．how much does it cost
D．however much it costs
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
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