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.todoisdo.这个的用法比如alltheyhavetodoisinternatyourhomebizforaweekend里面is后面为什么接intern原型不是interning或者tointern,是固定搭配吗?

题目详情
.to do is do.这个的用法
比如all they have to do is intern at your home biz for a weekend里面is 后面为什么接intern原型不是interning或者to intern,是固定搭配吗?
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答案和解析
传统上来说,类似的用法是is to do或者直接doing,但现在看美剧也有is do的.只能说语言是个变化的东西,不能一成死板.
All you need to do is to keep quiet
All you need to do it keeping quiet
All you need to do is keep quiet
So,what do you think?