单项选择题

The（）between the two buildings measures 30 meters.

A．interval
B．pace
C．realm
D．district

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单项选择题

He has not quite solved the problem yet, but he is（）it.

A．making of
B．working on
C．clearing up
D．trying out

单项选择题

（）Mary had heard that sound was she really frightened.

A．Not when
B．Not as
C．Not until
D．Until

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