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The survey __________ our school last month shows that about

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The survey __________ our school last month shows that about 2 percent of the students are addicted to Internet games.
A.conducted B.having been conducted C.conducting D.to be conducted
A

动词conduct与主语the survey之间存在着动宾关系,所以需用被动形式,依据last month可知,该动作发生在过去,排除CD。而B项答案不能作定语。conducted在此作定语,相当于which was conducted。