11. “Are Alice and Tom still living in New York?” “No, they _____ to Dallas.”
A. are just moved B. have just moved C. had just moved D. will just move

12. I haven't heard from Maria_____.
A. since a long time ? ?B. for many months ago
C. for many months ? ?D. since many months before

13. His grandfather ______ for thirty years.
A. died B. was dead C. has been dead D. has died

14． Its (high) time you _____ a holiday.
A. had B. have C. will have D. have had

15. By the time Juan gets home, his aunt _____ for Puerto Rico.
A. will leave B. leaves C. will have left D. left

16. All the machines ____ by the end of the following week.
A. were repaired ? ? ? B. will be repaired
C. have been repaired ? ? ?D will have been repaired

17. The conference _____ a full week by the time it ends.
A. must have lasted B. will have lasted C. would last D. has lasted

?
?【答案解析】
11. B 現(xiàn)在完成時態(tài)。說話的時候，他已搬走。
12. C 我已經(jīng)好幾個月沒有 Maria 的消息了。現(xiàn)在完成時態(tài)， for 引導一個時間狀語。
13. C 現(xiàn)在完成時態(tài)。他的祖父已經(jīng)去世三十年了。這里死亡表示一種狀態(tài)，而不能理解為一種動作，因為死亡是一個短暫性動詞，它不可能持續(xù)三十年。所以用 has been dead 。
14. A It's(high)time （是 …… 什么的時候了）的特殊用法，要用完成時態(tài)。 Have 在句中是擁有的意思。
15.C　將來完成時態(tài)。 Leave for 離開一個地方到另一個地方去， By the time 　信號詞。
16.D　將來完成時態(tài)。 by the end of 　到 …… 時間為止，在此句中引導的時間狀語從句為將來時間，所以是用將來時。答案 B ， D 選取哪個？機器（ machines ）是被修的，所以用被動語態(tài)。顯然， D 為正確答案。
17. B 譯文：會議從開始到結(jié)束，將持續(xù)整整一個星期。本句是將來完成時的用法。到將來某時(會議結(jié)束)之前業(yè)已完成的動作(last) ，所以用將來完成時。