1.[]The police tried in vain to break up the protest crowds in front of the government building.A.unskillfully B.violently C.ineffectively D.eventuallyABCD
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参考答案：C
参考解析：句意为：警察试图驱散在政府大楼前抗议的人群，但毫无用处。in vain“徒劳地，无效的”，四个选项：unskillfully“笨拙地”；violently“剧烈地”；ineffectively“无效地”；eventually“最后”；所以C项符合题意。