单项选择题

It’s quite late now and Mr. White （） hasn’t left his office.

A. still
B. already
C. since
D. yet

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单项选择题
China started its space industry only in recent years, and should（）no time in catching up.

A. delay
B. lag
C. lessen
D. lose
单项选择题
(40) （）

A. unusual
B. particular
C. unique
D. typical
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