There must to be some monkeys_____ (escape) from the zoo.sorry,没to

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There must to be some monkeys_____ (escape) from the zoo.sorry,没to

There must to be some monkeys_____ (escape) from the zoo.sorry,没to
There must to be some monkeys_____ (escape) from the zoo.
sorry,没to

There must to be some monkeys_____ (escape) from the zoo.sorry,没to
must后面多打了个to吧?
横线上填:escaping
must be doing 对于现在的肯定推测
PS. 九年级U5的练习吧...P38页-3a中有同样的句子、

escaped