There was such a long line at the exhibition ________ we had to wait for about half an hour. ( 章节：1 难度：3)_做题室

单项选择题There was such a long line at the exhibition ________ we had to wait for about half an hour. ( 章节：1 难度：3): A、as; B、so; C、that; D、since

正确答案：C
答案解析：
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