there must have been several hundred people present.____1 there had to be 2 there must be 3 it was necessary to be 4 i think there were 选择哪一个,及为什么

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there must have been several hundred people present.____
1 there had to be 2 there must be 3 it was necessary to be 4 i think there were
选择哪一个,及为什么

4 i think there were
句子意思是:曾经这儿肯定有很多人出席.
回答应该是 我想这儿是有很多人出席过

There must have been 句型是表示对过去事实肯定的推测,
据此,答案选 4