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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Your father is seriously iii and you should（）a doctor at once.

A. send out
B. call in
C. go into
D. leave for
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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