I'm not free today because there are many things for me( )A.to do B.did C.doing D.to doin我英语基础差,请详细说明.

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I'm not free today because there are many things for me( )A.to do B.did C.doing D.to doin我英语基础差,请详细说明.
I'm not free today because there are many things for me( )A.to do B.did C.doing D.to doin
我英语基础差,请详细说明.

I'm not free today because there are many things for me( )A.to do B.did C.doing D.to doin我英语基础差,请详细说明.
选A 固定用法 there be sth (for sb) to do
首先B的时态不对,前后的时态不符
C的进行时态没有Be动词,另外也不符合固定用法
D本身就是错的短语

A. to do
不定式 to 后面原形
to do 去做.

选A 对于还没有做的事情用不定式!