a. before

b. until

c. when

d. after

a 强调从句中谓语动词的动作发生的晚，表示。。。。。。才。。。。。。。

35. this robot is supposed to save a lot of labor, but it remains

a problem if it ______

a. is

b. saves

c. does

d. has

c do(es) 是代动词，用来代替上文save a lot of labor。

36. there were many more people who got injured in the big

fire than _______.

a. was reported

b. it was reported

c. were reported

d. they were reported

a 比较状语从句中省略与主句相同的成分，只保留比较对象。

37. he doesnt know what to say, for it is the first time that he

______ with a girl.

a. went out

b. goes out

c. has gone out

d. had gone out

c

38. ___which way to take, the little boy behaved like a real gentleman who comforted his sister from time to time.

a. leaving to wonder

b. having left to wonder

c. left wondering

d. left to wonder

c left wondering 中left的逻辑主语是the little boy，所以可转换

成the little boy was left wondering?。

39. during the tourist season, there are many people wandering in this city to see the old castles _____ in the sixteenth century.

a. to be built

b. being built

c. having been built

d. built

d 非谓语动词的动作先于句中谓语动词的动作时，用过去分词。

40. when do you think ______ start the new attack?a. they will

b. will they

c. they can

d. can they

a

41. some 25,000 people were reported ______ in the ever recorded worst earthquake in iran, which occurred late this month.

a. were killed

b. to be killed

c. killing

d. to have been killed

42._____ the teachers suggestion, tom finally found a way to settle the problem.

a. following

b. to follow

c. follow

d. he followed

43.______ that no one was ever prepared for it.