单项选择题

Our teacher insists that we ______ all our essays on alternate lines.

A．write
B．wrote
C．must write
D．ought write
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单项选择题
It is no ______ asking him to come now. He is busy.
A．use
B．excuse
C．useless
D．point
单项选择题
The traditional approach with complex problems is to break them down into smaller, more easily managed problems.
A．to dealing
B．of dealing
C．dealing
D．to deal
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