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    18、____ exchange students can learn many useful things, it is also possible that some of them may fall behind in their studies.t

       A. Since          B. While           C. If           D. When

    18、 B

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    ____ exchange students can learn many useful things, it is also possible that some of them may fall behind in their studies.t

       A. Since          B. While           C. If           D. When

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