问题补充:
.he made up his mind, nothing could change it.
A. Before
B. Unless
C. When
D. Once
答案:
A. Before
B. Unless
C. When
(答案→)D. Once
解析:
这题考查连词的用法:once“一旦”,句意是:一旦他下定决心,没有什么可以改变。选D。
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