单项选择题

Under no circumstances（）leave his post.

A. a soldier mustn't
B. a solider must
C. mustn't a soldier
D. must a solider

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单项选择题
People were not fully aware that peace of mind was very important for health（）

A. 人门过去并未充分了解心灵的宁静对健康极为重要。
B. 如果人们能感觉到大脑的平静，那将对健康极为重要。
C. 人们过去对于心灵的宁静对健康的极端重要性并不了解。
D. 大脑的平静对健康极为重要，这一点人们尚未充分意识到。
单项选择题
The farmers,（）houses had been destroyed by the serious flood, were given help by the government.

A. who
B. what
C. which
D. whose
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