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Itwasnottheycameback.AlongbeforeBbeforelongClongtimebeforeDlongafter我还是弄不清楚这四项的区别,

题目详情
It was not___ they came back.
A long before B before long C long time before D long after
我还是弄不清楚这四项的区别,
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答案和解析
这里应该分开看,It was not long和before they came back,不久他们就回来了
long就可以代表是时间了,没必要再加个time