问题补充：
单选题Whatdoyouimagine_____himfromgoing?A.to preventB.preventingC.to have preventedD.prevented
答案：
D解析do you think (believe, guess, etc)也是插入成分，但其后接的句子用陈述句语序：Who do you think he will marry?你认为他会同谁结婚？What do you think we should give her?你认为我们该给她点什么呢？When do you believe he will come?你认为他会什么时候来？What do you guess he wants to buy?你猜他想买什么呢？
