________ is very difficult for us ________ so much work in so little time.
A.It;finishB.It;finishingC.He;tofinishD.It;tofinish...
A. It; finish
B. It; finishing
C. He; to finish
D. It; to finish 展开
B. It; finishing
C. He; to finish
D. It; to finish 展开
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