It is not clear ____ they will continue the work or not.A that B whether C if D that if

题目

It is not clear ____ they will continue the work or not.A that B whether C if D that if
请问这道英语单选选哪个呢?
请告知为什么选那项,别的为什么不选?最后还请翻译一下这句话..

答案

B whether 为正确选项. 这是个主语从句,it是形式主语,真正的主语是后面whether they will continue the work or not.“is not clear” 意思是“还不清楚”,凡是这类“not clear,don't know”“wonder”等表示“情况...