Unit3  Computers  Book2

a. has been completed        b. has completed  
c. will have been completed   d. will have completed
[解析]賓語從句中主語all construction work for the beijing olympics和謂語動(dòng)詞complete之間有被動(dòng)關(guān)系，所以謂語要用被動(dòng)語態(tài)，因此排除選項(xiàng)b和d；by 暗示謂語要用將來完成時(shí)態(tài)，因此答案選c。
3. all the preparations for the task ________, and we are ready to start.(nmet春招)
a. completed   b. complete  c. had been completed  d. have been completed
[解析]本句的意思是：這項(xiàng)工作的一切準(zhǔn)備工作已經(jīng)就緒,我們只等開始了。前半句主語和謂語有被動(dòng)關(guān)系，后半句暗示說話是從現(xiàn)在著眼，所以用現(xiàn)在完成時(shí)態(tài)的被動(dòng)語態(tài)。答案d。
練習(xí):
★單項(xiàng)填空
1. paper money _____ for over a thousand years.
a. used   b. has been used   c. has used    d. is using
2. come and sit down by the fire. your hand _____ cold.
a. has been left   b. feels   c. is left   d. has left
3. till now, three films _____ in that small village this month.
a. have shown      b. have been shown
c. were shown      d. will be shown
4. do you know the thief _____ by the police?
a. has caught      b. has been catching
c. was caught      d. has been caught
5. my sister is working in the power plant that _____ for just one year.
a. was used        b. has been used
c. is used         d. has used
6. is this the reason _____ he explained at the meeting for his carelessness in the work?
a. /    b. what    c. how    d. why
7. they were all very tired, but none of them would stop _____ .
a. taking a rest   b. to take a rest
c. resting         d. rest
8. her face went red _____ he had said.
a. because that    b. because what
c. because of what  d. because
9. tom prefers _____ rather than _____ .
a. stay at home; go out     b. to stay at home; go out
c. stay at home; to go out  d. to stay at home; to go out
finish the exercise on page 21 (discovering using structures )
             blackboard design: