单项选择题

In order not to be disturbed, I spent three hours () in my study.

A.locking
B.locked
C.to lock
D.being locked

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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

单项选择题

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

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

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