last sunday morning ,i did nothing but _(write) 请问此空格里填写原型还是动词ING形式?

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last sunday morning ,i did nothing but _(write) 请问此空格里填写原型还是动词ING形式?
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last sunday morning ,i did nothing but _(write) 请问此空格里填写原型还是动词ING形式?
last sunday morning ,i did nothing but _(write) 请问此空格里填写原型还是动词ING形式?

last sunday morning ,i did nothing but _(write) 请问此空格里填写原型还是动词ING形式?
write
这里的but应该是介词而不是连词
当介词but,except,besides前面有实义动词do时,不定式在介词之后可以省去to
这里有两个例子,试比较:
1.The enemy can do nothing but surrender敌人除了投降之外,别无出路
2.The enemy had nothing to choose but to surrender
因为do nothing 中有do,所以后面无to
有个规则;前有do,后无to

wrote 跟did并列

ing形式

writing (ing形式) 此处需要填动名词。