单项选择题

The plane was ______ at 12:00 sharp if it had not been for the storm.

A. to take off
B. taken off
C. taking off
D. to have taken off
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单项选择题
When I entered the living room, mother didn’t say anything, but I noticed a ______ look had come over her face.
A. surprised
B. surprising
C. surprise
D. surprisingly
单项选择题
______ the other boys and girls were playing on the playground, she alone remained in the classroom reading.
A. Now that B. Since C. While D. As
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