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) comes17.Scientists should be kept ________ of the latest developments in

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) comes17.Scientists should be kept ________ of the latest developments in
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) comes17.Scientists should be kept ________ of the latest developments in
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

16 D
17 C
18 A
19 A
20 A
应该不用一个个解释吧，你哪几道不懂再追问