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题型：单选题题类：常考题难易度：普通

江苏扬州高邮市2020届高三上学期英语开学考试试卷（含小段音频）

It is through years of research______ scientists have discovered the relationship between social media addiction and depression.

A、since B、before C、that D、when

举一反三

Was it through Mary _____ was working at a high school _____ you got to know Tom?

— made her ashamed of herself?

— the lowest mark in her class.

Was it because Jack came late for school ______ Mr. Smith got angry?

It is not until all the fish died in the river ________how serious the pollution was.

It was after having her first child at a time ______ my mother was working as a lawyer _______she decided to run for governor of the state.

It was his nervousness in the interview ______ probably lost him the job.

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