单项选择题

The government is doing a _______ of people's changing social habits.

A．plan
B．survey
C．project
D．research
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单项选择题
The title of the book was on the _______ of my tongue, but I just could not think of it.
A．end
B．tip
C．back
D．point
单项选择题
Her short stay in Kentucky in the mid-nineteen hundreds was very important to author Mary Holmes, _______ provided the background to several of her novels.
A．it was
B．for it
C．much of
D．by then
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