【正确答案】 D

【答案解析】英语交际用语中I guess/hope/think/believe/suppose/imagine/fear/expect．．．后接so表认同对方观点，或接not表不认同(亦可说I don't think/believe/suppose/imagine/ expect．．．so)，但I guess，I fear，I hope，I'm afraid只能用前一种否定，既I guess/fear/hope not，I'm afraid not．