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题型：单选题题类：常考题难易度：普通

Dropping litter ______ never allowed in our city.

A、don't B、are C、will D、is

举一反三

There ________ many changes to Beijing over the past years.

There __________ an elephant, two monkeys and three snakes in the zoo.

Do you know the number of the students in our school ?

___________he Sam?

are tidy, but Gina is not.

I often _______ to the Capital Library at weekends.

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