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    【题目】I was so familiar with him that I recognized his voice _____ I picked up the phone .

    A. while B. after

    C. in case D. the instant

    【答案】D

    【解析】A. while虽然；然而；当……的时候 B. after在……之后 C. in case万一；D. the instant一……就；

    句意：我和他如此熟悉以至于一接通电话我就听出他了。根据语境选D。

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