The students stood there and didn't know what they should do next.
=The students stood there and didn't know _____ _____ do next.
是how 还是what
人气：107 ℃ 时间：2019-08-20 02:43:58
解答
what to do 的意思是不知道干什么
how to do 的意思是知道干什么,但不知道怎么干.
所以根据题目应该是what to do
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