there must have been several hundred people present just before the show began.…这是什么语法?

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there must have been several hundred people present just before the show began.…这是什么语法?
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there must have been several hundred people present just before the show began.…这是什么语法?
there must have been several hundred people present just before the show began.…这是什么语法?

there must have been several hundred people present just before the show began.…这是什么语法?
1 现在完成时
2 时间状语从句

时间状语从句吧……