10. Mother was worried because little Alice was iii, especially _______ father was a-way in France.
A. as B. that C. during D. if
答：A．as为连词相当于when，而during为介词，一般不接从句。
11. She thought I was talking about her daughter, ________, in fact, l was talking a-bout my daughter.
A. who B. where C. which D. while
答：D．while表示“而……”，含有对比之意。
12. _______we are close friends, we also have different opinions.
A. When B. While C. Unless D. Once
答：B。while=although 虽然
13. I was just about to go out ________ the phone rang.
A. while B. as C. when D. since
答：C。when相当于atthat time就在那时。此用法不能用其他词代替。
14. He had left _______ I could thank him.
A. before B. after C. if D. unless
答：A。before表示动作的快，意为“还没……就……”。
15. It won’t be long _______ we meet again.
A. since B. before C. if D. when
答：B。“it won’t be十时间+before”意为“不久……就……”
16. —Isn’t he a student?
—________. It is two years since he was a college student.
A. Yes, he is B. No, he isn’t
C. Yes, he isn’t D. No, he is
答：B。“it is+时间+since”句型若接延续动词则译为“他不……多久了”。此题译为“他大学毕业两年了。”
17. If we work with a strong will, we can overcome any difficulty, _______great it is.
A. what B. how
C. however D. whatever
答：C。however接形容词或副词引导让步状语从句，whatever接名词。如：We will succeed whatever difficulties we meet。
18. Would you like a cup of coffee________ shall we get down to business right away?
A. and B. then C. or D. otherwise
答：C。or或者otherwlse否则，要不然的话，与句意不符。
19. —________I’m going to the post office.
—________ you’re there, can you get me some stamps?
A. As B. While C. Because D. If
答：B。while可指时间的一段，而when常指时间的一点。as常表示两个司作同时进行。while当……时。
20. _______you’ve got a chance, you might as well make full use of it.
A. Now that B. After
C. Although D. As soon as
答：A。nowthat＝since 既然