单项选择题

Not until a monkey is several years old ______ to exhibit signs of independence from its mother.

A．it begins
B．does it begin
C．and begin
D．beginning
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单项选择题
It's impossible for parents to ______ their children from every danger.
A．shield
B．conserve
C．relieve
D．free
单项选择题
He's written a book the name ______ I have completely forgotten.
A．which
B．that
C．of whom
D．of which
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