——When _____ the abacus _____? ——In the sixth century by the Chinese people.

题型：单选题题类：模拟题难易度：普通

A、is, invented B、did, invent C、was, invented D、does, invent

举一反三

—It's me. This photo _______ when I was five.

—His legs hurt. He was {#blank#}1{#/blank#} (撞)by a motorcycle this morning.

— Sure. It ___________________ in 1970 to tell us to protect our planet.

—It's fantastic. It ____ by Disney.

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