There isn't much work ________ by them.

There isn't much work ________ by them.

A.to do

B.to be done

C.being done

D.which to be done

答案及解析： B

解析：

导解：there be句中不定式作定语通常用主动形式，但若出现by短语，明显表被动动作，则要用被动结构．