单项选择题

(Lost in thought), she (didn't hear) the thunder (to begin) in the mountains (far off).

A. Lost in thought
B. didn't hear
C. to begin
D. far off
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He demanded that the problem ______ at once.
A. would be solved
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C. is solved
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单项选择题
______ doing so, we decided to sell our new car at any price.
A. As
B. For
C. During
D. While
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