单项选择题

--Is Mrs White in the office
--Yes, () she is on duty, she must be there.

A.since
B.until
C.for
D.if

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单项选择题

We recognized his voice () he spoke on the radio.

A.while
B.after
C.in case
D.the moment

单项选择题

The news reporters hurried to the airport, only () the film stars had left.

A.to tell
B.to be told
C.telling
D.told

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