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【单选题】 Which of the following is correct in its use of punctuation?
参考答案:D
【单选题】 The twins () so much alike that I can 't tell them apart.
参考答案:A
【单选题】 () she heard her grandfather was born in Germany.
参考答案:C
【单选题】 Before you leave the office ,() all lights are out.