The cleaning workers are on strike to make they are doing an important and necessary job for society.
A. it clear that
B. it clearly that
C. that clear
D. that clearly
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(答案→)A. it clear that
B. it clearly that
C. that clear
D. that clearly
解析：本题考查名词性从句。本题考查V + it + adj + that从句，句中it作形式宾语，真正的宾语为从句that they are doing an important and necessary job for society。故选A。