单项选择题

No one has（）been able to know who she is.

A．still
B．yet
C．already
D．just

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单项选择题

Children don't need to be made（）. Interest is the best teacher.

A．to learn
B．learning
C．to have learned
D．learn

单项选择题

Environmental protection（）everyone's support.

A．calls for
B．calls forth
C．calls off
D．calls up

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