单选题Hegaveusanotherpieceofadvice,____

单选题 He gave us another piece of advice, ________ of great help to the research work.A.which I think isB.which I think it isC.I think which isD.I think it is

A解析试题分析：考查从句，首先分析句子，从句of great help to the research work.缺少主语和谓语，又是个非限制性定语从句，所以选A考点：考查从句点评：从句是近几年来高考热点，从句的关键在于分析句子结构，如果定语从句很完整就使用关系副词；如果句中缺少主语，宾语，表语或者定语就使用关系代词。同时也要注意关系词的一些固定用法即学即练：The reason__________ their failure you know is__________ they didn't get fully prepared for the experiment． A．why, that B．that, why C．for, that D．why, because选C

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