咏柳图片大全:英语填空题

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John (go) to college to study more about electricity after radios (invent)

went
were invented

John (went) to college to study more about electricity after radios (were invented).

1.goes
2.invented

John went to college to study more about electricity after radios were invented.

John went to college to study more about electricity after radios had been invented.

went
were invented