题型：单选题题类：模拟题难易度：普通

The boys put ___________ school bags on the playground.

A、they B、theirs C、them D、their

举一反三

— Yes. They're {#blank#}2{#/blank#}. (they)

This watch is{#blank#}1{#/blank#} and that watch is{#blank#}2{#/blank#}.

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