单项选择题

He left his mountain village and worked in the town. The least he could do is ______ his parents once in a while.

A．write to
B．wrote to
C．to write to
D．be writing to
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单项选择题
By the time we hurried through the heavy traffic to the airport, the plane ______.
A．was taking off
B．would take off
C．had taken off
D．took off
单项选择题
Exceeding speed limits and ______ safety belts are two common causes of automobile death.
A．not having worn
B．not to wear
C．failing to wear
D．don't wear
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