The students aren't in the classroom. They ___________(go) to the library.

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Thestudentsaren''tintheclassroom.They___________(go)tothelibrary.Thestudentsaren''tintheclassroom.They

The students aren't in the classroom. They ___________(go) to the library.
The students aren't in the classroom. They ___________(go) to the library.

The students aren't in the classroom. They ___________(go) to the library.
对已经发生的事情进行猜测用:must be .所以这道题的答案是:must go ;