第15题: [单项选择]You __ me because I didn't say that. A. must have misunderstood B. had to misunderstand C. must misunderstand D. must be misunderstanding 参考答案:A
第17题: [单项选择]They overcame all the difficulties and fulfilled the plan three months ahead of time, ______ is something we had not expected. A. that B. what C. it D. which 参考答案:D 答案解析:本题为语法结构题。非限定定语从句不能由that引导,通常只能由除that以外的关系代词或关系副词引导。本句大意为;他们克服了所有困难提前三个月完成了计划,这是我们没有预料到的。