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It was not until dark__he worked out the last result of the experiment.
A what
B that
C when
D before
为什么不能选C而选B?
人气:378 ℃ 时间:2019-09-17 22:05:06
解答
not until 已经是完整的时间陈述短语
it is that 是强调这个时间段
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