单项选择题

I do not think ______ possible to master a foreign language without much memory work.

A．this
B．that
C．its
D．it
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单项选择题
It is certain that no food is as good as ______ earned by one s own labor, whether physical or mental.
A．such
B．that
C．what
D．one
单项选择题
Children who stay away from school do ______ for different reasons.
A．them
B．that
C．it
D．theirs
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