求一道极难的高一英语选择题

49. —Why didn’t Susan come to see us yesterday as she promised?
—______.
A. She must be busy B. She might have been free
C. She must have been busy D. She can’t be free
选Cmust have been busy 表过去

_________ he knew nothing about her.

A.He appears as if
B.He seems that
C.It seems as if
D.It appears as if
选C

Here are a lot of suggested changes.Could you ...... some of these changes yourselves?
A.have B.give C.make D.suggest

Some American colleges are state-supported, others are privately ______,and still others are supported by religious organizations.
A. ensured B. attributed C. authorized D. endowed

答案 D