一、单项选择 （20%，共20题，每小题1分，满分20分）
21. I wonder ________ of you is ________ such an accident.
A. who ; to be blamed on B. who ; to blame for
C. which ; to blame for D. which ; to be blamed for
22. —You should have thanked her before you left.
—I meant _______ , but I just couldn’t find her.
A. to do B. to C. doing it D. doing
23. You can’t borrow books from the school library ______ you get your student card.
A. before B. if C. while D. as
24. Compared with me, my sister is even more ________ to, and more easily troubled by emotional and relationship problems.
A. curious B. addicted C. available D. sensitive
25. If you have a job, _______ yourself to it and finally you’ll succeed.
A. do devote B. don’t devote C. devoting D. not devoting
26.—Some Chinese students find it difficult to understand native speakers when in London.
—Exactly, _______ they’ve learned a lot about grammar and known many words.
A. what if B. now that C. as if D. even if
