31. After describing the planned improvements, she went on _______ how much they would cost.
A. to explain B. explaining
C. to be explaining D. having explained
32. Please excuse me _______ your letter by mistake.
A. to open B. to have opened
C. for opening D. in opening
33. Please remember _______ the plants while I’m away.
A. watering B. to be watering
C. to water D. being watering
34. Certainly I posted your letter — I remember ______ it.
A. posting B. to post
C. to be posting D. have posted
35. Stop _______ me to hurry up. I can only go so fast.
A. to tell B. telling
C. to have told D. having told
36. Remember _______ off the light when _______ to bed.
A. turning, going B. to turn, to go
C. turning, to go D. to turn, going
37. _______ time, he’ll make a first-class tennis player.
A. Having given B. To give
C. Giving D. Given
38. _______ in 1636, Harvard is one of the most famous universities in the United States.
A. Being founded B. It was founded
C. Founded D. Founding
39. The lady said she would buy a gift for her daughter with the ________.
A. 20 dollars remained B. 20 dollars to remain
C. remained 20 dollars D. remaining 20 dollars
40. The picture _______ on the wall is painted by my nephew.
A. having hung B. hanging
C. hangs D. being hung
【答案与解析】
31. 选A。go on doing sth = 继续做同一事情，go on to do sth = 做完某事后续继做某事。
32. 选C。excuse sb for doing sth 意为“原谅某人做了某事”。
33. 选C。remember doing sth = 记住曾经做过的事，remember to do sth = 记住要做的事。
34. 选A。remember doing sth = 记住曾经做过的事，remember to do sth = 记住要做的事。
35. 选B。根据下文的 I can only go so fast 知前文应是叫对方不要老催自己快走。比较：stop doing sth = 停止做某事，stop to do sth = 停下正在做的事去干另一事。
36. 选D。一是分清以下两个结构：remember to do sth=记住做某事，remember doing sth=记住曾做过某事；二是注意 when going to bed 相当于 when you go to bed。
37. 选D。由于动词 give 与其逻辑主语 he 是动宾关系，故用过去分词，即选 D。其中 Given time 可视为 If he is given time 之略。
38. C。由于 Harvard（哈佛大学）与 found（建立）是被动关系，且因句中有 in 1636，故选 C。注意不能选 B，否则前后两句之间缺少必要的连词。
39. 选D，由于 remain 为不及物动词，所以包含过去分词 remained的A和C不宜选（因为两者均含有被动意味）；选项B也不宜选，不定式to remain 用作修饰 20 dollars 的后置定语，由于彼此之间有逻辑上的动宾关系，故不妥（因为 remain 不及物）。现在分词remaining 的意思是“剩下的”。
40. 选 B。动词 hang 表示“悬挂”时，可用作及物或不及物动词，此处填 hanging 或 hung 均可，但不能填 being hung，因为它表示动作正在进行，而此处表示的是一种悬挂的状态。
