【单选题】【消耗次数:1】
4.Scientists didn’t know much about lung cancer ______.
before long
until recently
long before
in the past few years
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①  after
②  until
③  when
④  before
【判断题】 It wasnt long before Mother had a full enrollment and a waiting list.
①  正确
②  错误
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①  businesses employed
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①  A.在马克·吐温完成最后一部小说之前,已经是好几年了。
②  B.在马克·吐温完成最后一部小说之前,又是好几年了。
③  C.过了好几年,马克·吐温才终于完成最后一部小说。
④  D.马克·吐温完成了最后一部小说时,又过了好几年。
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①  risen
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①  A. I like it.
②  A. You are wonderful.
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④  very good
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