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All possible means _________.However, nothing can _________ him dying of lung cancer.

[  ]
A.

has tried; stop

B.

have been tried; keep

C.

has been tried; prevent

D.

have been tried; stop

答案:D
解析:

means單復數相同,在此是復數。stop sb.from doing 中的from可省略,而keep sb.from diong中的from不可省。


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