单项选择题

______ he daydreamed, Peter saw figures in the sky.

A．Until
B．Since
C．While
D．During
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单项选择题
According to official statistics, retail sales in China rose 10% and 12.2% in the first and the second quarter ______ this year.
A．accordingly
B．correspondingly
C．respectively
D．individually
单项选择题
This book has been in the works so long that I have lost ______ of most of the sources found for me by the staff of the library.
A．trace
B．trail
C．track
D．touch
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