单项选择题

The airline requested a （） call to ensure a seat on my flight back home.

A.confirm
B.confirmed
C.confirming
D.confirmation

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单项选择题

（） announcing his retirement, Mr. Kinsley has been busy trying to train his replacement.

A.Because
B.Once
C.Since
D.While

单项选择题

Mr. Chan’s main role in the company for the next two weeks is to look （） the right person to take over Mr. Shaw’s position when he leaves at the end of the month.

A.in
B.for
C.over
D.from

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