11._______ for your laziness，you could have finished the assignment by now.
A. Had it not been
B. It were not
C. Weren‘t it
D. Had not it been
12.The new discovery _______ be of great service to mankind.
A. is bound to
B. is bound for
C. be bound to
D. be bound for
13.Sickness often _______ eating too much.
A. as a result of
B. result of
C. result in
D. result from
14.It took me a month to get rid _______ the cough.
A. for
B. as
C. of
D. over
15.They are eager _______ abroad.
A. travel
B. travelled
C. to travel
D. travelling
16.I would love ________ to the party last night but I had to work extra hours to finish a report.
A. to go
B. to have gone
C. going
D. having gone
17.________ in thought， he almost ran into the car in front of him.
A. Losing
B. Having lost
C. Lost
D. To lose
18.—You were brave enough to raise objections at the meeting.
—Well， now I regret ________ that.
A. to do
B. to be doing
C. to have done
D. having done
19.The missing boys were last seen ________ near the river.
A. playing
B. played
C. play
D. to play
20.The visiting minister expressed his satisfaction with the talks， ________ that he had enjoyed his stay here.
A. having added
B. to add
C. adding
D. added
11.正确答案：A
答案解析：句意：要不是你懒惰，到现在你就能完成任务了。本题是一个省略if的虚拟条件句，主句用could have done表示与过去事实相反，条件从句应用had done形式，had要提前构成倒装。
12.正确答案：A
答案解析：be bound to：注定要，一定会。本题中主语是The new discovery，所以谓语动词要用is.句意：这项新发现对于人类必定大有用处。
13.正确答案：D
答案解析：本题考查result 的词组辨析。
as a result of：由于…的结果result in：导致result from：由…造成，因…而产生
14.正确答案：C
答案解析：get rid of：摆脱掉，处理掉
15.正确答案：C
答案解析：be eager to do sth：渴望做某事。句意：他们盼望出国旅行。
16.正确答案：B
答案解析：本题考查非谓语动词与虚拟语气。would love to do 为一固定搭配形式，其中不定式表示想要做的动作。但此句中but 连接的句子说明其实动作并没有发生，所以这里要用虚拟语气表示与过去事实相反，选用B项。
17.正确答案：C
答案解析：这里分词短语的意义应为“As he was lost in thought ”，意为“由于陷入沉思”，这儿填入过去分词短语，表示一种状态，用作原因状语。
18.正确答案：D
答案解析：regret后所跟动词有to do 与doing两种形式，不定式表示“为做某事而遗憾”， doing 表示“为做过某事而后悔”。“having done”则更强调动作已发生而无法挽回。
19.正确答案：A
答案解析：所填的词为主语补足语，因其后有明确的地点，补足语表示动作当时正在进行中，所以只能使用playing.
20.正确答案：C
答案解析：此处所填的词与其后的宾语从句构成状语，表示伴随情景。add是及物动词(有自己的宾语从句)，此处adding表示主动意义，所表示的动作与谓语动作同时发生。
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