题型：单选题题类：常考题难易度：普通

人教新目标版九年级Unit6 When was it invented? Section A同步练习

The coat to warm.

A、uses; keep B、uses; keeping C、is used; keep D、is used; keeping

举一反三

—OK. I will study hard from now on.

—Because I have too much homework ____.

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