It won`t be( )scientists can find out medicine to cure this disease.A.long after B.befor longC.long befor D.long since

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It won`t be( )scientists can find out medicine to cure this disease.A.long after B.befor longC.long befor D.long since
It won`t be( )scientists can find out medicine to cure this disease.
A.long after B.befor long
C.long befor D.long since

It won`t be( )scientists can find out medicine to cure this disease.A.long after B.befor longC.long befor D.long since
答案C
用不着多久科学家们就会研究出治疗这种疾病的药物了
固定句型
it won't be very long before + 句子(谓语动词用一般现在时)
表示“用不了多长时间就……”“很快”
It won't be long before I return to Beijing
翻译:我很快就要回北京了

C

答案选C 。属于句型:It is /was +一段时间+before 。。。意思是:。。。还要多长时间。这里是该句型的否定形式。
科学家要不了多久就能找到治愈这种疾病的药了。