单项选择题

It's impossible for parents to ______ their children from every danger.

A．shield
B．conserve
C．relieve
D．free
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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
单项选择题
He cannot speak Japanese well; ______, he is incapable of speaking the language.
A．therefore
B．so
C．but
D．in fact
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