单项选择题

Scientists are seeking ways to () cancer

A. conquer  
B. defeat   
C. overcome   
D. subdue

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单项选择题
For a whole night she () buried in the snow.

A. lay       
B. laid        
C. lain       
D. lied
单项选择题
Anyone breaking the roles will be asked to leave()

A. at the spot
B. on the spot
C. for the spot
D. in the spot
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