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题型：单选题题类：真题难易度：普通

For kids of this age, two hours of sitting in a classroom ________ too long.

A、is B、are C、was D、were

举一反三

Either you or I ______ going there tomorrow．

This {#blank#}1{#/blank#}(be)Mike and that {#blank#}2{#/blank#}(be)Mary.

Both teaching and research work{#blank#}1{#/blank#}(be)making great strides.

这个学校的学生数量将会增加到2000人

The elderly man pushed the small ducks into the river. (改为被动句)

The small ducks {#blank#}1{#/blank#} {#blank#}2{#/blank#} into the river by the elderly man.

—Where{#blank#}1{#/blank#} (be) lions from?

—Sorry, I don't know.

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