When was _______ umbrella_______？

题型：单选题题类：常考题难易度：普通

牛津译林版九年级下册Unit2Great people单元测试

A、/ ; invented B、a ; discovered C、an ; discovered D、the ; invented

举一反三

-- Sorry, Mrs. Brown. I've _______ it at home.

—I take the train.

— Most parents expect to see their children ________ hard the whole day.

— Hmm. It _______ interesting.

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