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It won't be long before such a thing ______ again.

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It won't be long before such a thing ______ again.
A.will happen B.happens C.is happened D.will be happend
It won't be long before such a thing ______ again.
B
这里的befor与if从句的用法差不多,像if做”如果”解释时,后面跟的是一般现在时:
We won’t go hiking if it rains
tomorrow.
如果明天下雨我们就不会去远足拉(rains,一般现在时)