单项选择题

Mr. Johnson prefered ______ the job of looking after the children.

A．to be assigned
B．to have assigned
C．to be assigning
D．having assigned
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单项选择题
He was late for the class today because he didn't run ______ catch the bus.
A．enough fast to
B．fast enough to
C．fast enough
D．enough fast
单项选择题
By next summer he ______ in the biology school of Harvard University for three years.
A．will have been studying
B．have studied
C．will study
D．will be studying
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