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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

Look! Here are _______ under the bed.

There _______ a boy and two girls in the music room, they are singing.

Either they or Paul ______ to go to Beijing in 2014.

Newborn babies r{#blank#}1{#/blank#} a lot of care.

It{#blank#}1{#/blank#}（看起来像）that they know what you're doing that for.

Playing computer games too often ___________bad for us.

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