2. “I heard they went skiing in the mountains last winter.” “It ____ true because there was little snow there.”

A. may not be           B. won’t be                C. couldn’t be               D. mustn’t be

此題最佳答案為C，主要由下文的 because there was little snow there 這一語境所決定，既然“沒下什么雪”，那么“滑雪”就應(yīng)是“不可能”，所以選 couldn’t be，即選C。

3. “Do you think he is lazy?” “I ________ so once, but I don’t now.”

A. may have thought                                   B. can have thought

C. may think                                              D. might think

答案選A。從答話人的語境可知，空格處的意思“曾經(jīng)這樣想過”，即對過去情況作推測，故應(yīng)用“情態(tài)動詞+動詞完成式”；又因?yàn)?/FONT> can 表推測不用于肯定句，故選A。