单项选择题

The changes made in the working conditions at our company resulted in remarkable improvements in all aspects of our business and （） more so in the morale of our employees.

A.all
B.any
C.even
D.although

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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
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
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