问题补充：
he has made up his mind to do something, nothing will stop him.
A. Once
B. Before
C. Although
D. As if
答案：
(答案→)A. Once
B. Before
C. Although
D. As if
解析：词义辨析题。一旦他下定决心什么事情都不能阻止他。A. Once一旦 B. Before 以前 C. Although 虽然 D. As if 似乎根据语境选A
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