题目

Some of the scientists held the point ______ the book said was right. A. that   B. what that   C. that what   D. that that   答案：Cthat引导从句作point的同位语从句，that不可省略。在同位语从句中what the book said是主语从句。what作said的宾语。  5．-I had a very boring weekend at home．-Why did you stay at home？You _____ with us．（　　）A．might hikeB．could have hikedC．should hikeD．must have hiked