all you had to do was think a little harder ,was后面为什么加think的原形?
问题描述:
all you had to do was think a little harder ,was后面为什么加think的原形?
答
为你
was 是系动词,后面的不定式短语 to think... 作表语.
当was前面出现动词do的时候,不定式符号to可以省略,此时就剩下think了.
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