单项选择题

______ with enough instruments necessary for the experiment, these scientists are expecting to finish it ahead of time.

A．To be supplied
B．To supply
C．Supplying
D．Supplied
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单项选择题
Education, reserved to the states or the people in file U. S., is a ______ of the state, not the federal government.
A．condition
B．performance
C．requirement
D．function
单项选择题
Human beings have used tools for a long time, ______ they would not have been able to develop their intelligence so fast.
A．doubtlessly
B．therefore
C．otherwise
D．consequently
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