问题补充：
He cut off half his right arm a knife the dangerous situation.
A. with , under
B. with, in
C. in, in
D. in, under
答案：
A. with , under
(答案→)B. with, in
C. in, in
D. in, under
解析：句意：在危险的条件下他用刀将他自己的右手的一半切开。分析在……形式下用介词in, 用某物为介词with.故选B
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