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顺便告诉我为什么这么选

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顺便告诉我为什么这么选
16.They will not start the project until the board chairman __ back from South Africa.
  A) will come
  B) is coming
  C) came
  D) comes
17.Scientists should be kept ________ of the latest developments in their research areas.
  A) inform
  B) informing
  C) informed
  D) to inform
18.Only when we had finished all the work _____ that it was too late to take a bus home.
  A) did we realize
  B will we realize
  C) we did realize
  D) we will realize
19.Not until that day ________ the importance of good manners in a job interview.
  A) did I realize
  B) I did realize
  C) I have realized
  D) have I realized
20.We haven’t enough rooms for everyone,so some of you will have to ________ a room.
  A) share
  B) stay
  C) spare
  D) live
顺便告诉我为什么这么选
16.They will not start the project until the board chairman __ back from South Africa.
  A) will come
  B) is coming
  C) came
  D) comes
答案:D.此处用一般现在时表示按计划在将来一定会发生的事.
17.Scientists should be kept ________ of the latest developments in their research areas.
  A) inform
  B) informing
  C) informed
  D) to inform
答案:C.句子意思为:科学家们应当及时告知他们研究领域的最新进展.此处,最新进展是被 科学家们告知他人的,故用被动语态.
18.Only when we had finished all the work _____ that it was too late to take a bus home.
  A) did we realize
  B will we realize
  C) we did realize
  D) we will realize
答案:A.倒装语句.
19.Not until that day ________ the importance of good manners in a job interview.
  A) did I realize
  B) I did realize
  C) I have realized
  D) have I realized
答案:D.1,倒装语句;2,现在完成时强调过去发生的事对现在造成的影响.
20.We haven’t enough rooms for everyone,so some of you will have to ________ a room.
  A) share
  B) stay
  C) spare
  D) live
答案:A.share表示分享,共享