问题
选择题
Paul____be in the school now, for I saw him looking after his father
In the hospital just now
A can not B must not C need not D may not
答案
答案：A
词义辨析。can not不可能；must not不应该，不可以；need not不必；may not可能不。句意：Paul现在不可能在学校，因为我刚刚看到他在医院照顾他的父亲。所以选A。