为什么要选A,其他为什么不能选.相关知识和语法,it was not easy for you _____the work in such a short time.A.to finish B.finish C.finishing Dfinished

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为什么要选A,其他为什么不能选.相关知识和语法,
it was not easy for you _____the work in such a short time.
A.to finish B.finish C.finishing Dfinished

固定用法: it's+ 形容词+ for sb to do sth
不定式作主语.