单项选择题

He demanded that the problem ______ at once.

A. would be solved
B. is to be solved
C. is solved
D. be solved
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______ doing so, we decided to sell our new car at any price.
A. As
B. For
C. During
D. While
单项选择题
The train ______ of the station right on time.
A. pulled
B. pulled down
C. pulled on
D. pulled out
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