John had never been abroad before, ________ he found the business trip very exciting. ( 章节：1 难度：2)_做题室

单项选择题John had never been abroad before, ________ he found the business trip very exciting. ( 章节：1 难度：2): A、because; B、though; C、so; D、while

正确答案：C
答案解析：
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