Cleaning and maintaining my house used to feel arduous and often

Cleaning and maintaining my house used to feel arduous and often left tasks ______ .
A、unfinishing
B、to finish
C、unfinished
D、finish
【正确答案】：C
【题目解析】：Leave的宾语后面通常跟分词作宾补。此句的意思是打扫和保持房子卫生让我感到很难，经常没搞完卫生。Task和unfinish之间是动宾关系需要用被动形式即-ed分词。