单项选择题

Everyone tried to find an answer to the problem, but （）of them could do it.

A. none
B. neither
C. each
D. all

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（）box cannot be lifted by a boy of five.

A. So a heavy
B. So heavy a
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D. Such heavy a
单项选择题
The woods （）the city （）the sand.

A. stopped; from
B. kept; away
C. protected; from
D. prevented; from
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