This is Mr Smith, ________ I think has something interesting to tell you．
A.whoB.whomC.thatD./在线课程A
此题容易错选B项，认为先行词Mr Smith作think的宾语。I think, you think, do you think等表明某人观点的短语是插入语，插入语的特点是将其去掉后不影响句子的表达。所以做题时遇到插入语，先去掉，This is Mr Smith, has something interesting to tell you．很容易得到答案A项。