A new ______ bus service to Tianjin Airport started to operate two months ago.A.normalB.usualC.regularD.mon
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C解析句意：一趟开往天津机场的新班车两个月前开始运营。normal--in accordance with what is usual or regular常态的，正规的；usual--customary 通常的；regular--happening, ing or done repeatedly at times or places which are the same distance apart有规律的；mon--happening or found often and in many places常见的。依题意“开往机场的新班车”可知此车是按规定时间运营的，即“有规律的”。