【正确答案】 B

【答案解析】句意：如果你同意调查此事我将十分高兴。look up： 在书中查到：When you do not understand a word, you can look it up in this dictionary. 当你不懂一个单词时。可以查这本词典。look at: 看：I look at the lady. 我注视那妇人。look into: 调查，检查：The committee is looking into the cause of accident. 委员会正在调查事故的原因。 look for: 寻找，寻求：They were looking for the missing child. 他们正在寻找那失踪的小孩。