Question

—Do you know Earth Day?

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

A. sets up                     B. set up                       C. is set up                   D. was set up

Answer 1

【答案】D

【解析】考查动词短语的时态和语态。Set up动词短语，意为“创立、建立”；又根据语境主语it代指地球日，物作主语句子应该用被动语态；并且in 1970是指过去的时间状语，因此句子应用一般过去时。故D项正确。