They attend a series of ________ on history.
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答案:当然是lecture 知识点:attend一般用于 school,meeting,class,lecture等,a series of后面跟的东西是可数名词复数或不可数名词.这是一般规定,talk,和speech都不能用attend.have a talk 或者deliver/make/give a speech用法不同的.