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
科目：高中英語 來源： 題型：
____ 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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