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题型：单选题题类：常考题难易度：普通

—Oh, my God! I can't find my key to the office.
—Don't worry. Perhaps it______________ in your home.

A、left B、has left C、was left

举一反三

"The story of the red-crowned crane" {#blank#}1{#/blank#} (write) in memory of Xu Xiujuan.

The factory________ in 1985. It has________ workers in it now.

His books {#blank#}1{#/blank#}(translate) into three languages last year.

—Who's the little boy in the photo？

—It's me. The photo when I was six years old.

—Do you know who invented lights?

—Yes, they by Edison.

The slave_________ from morning till night.

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