1. All flights ___ because of the snowstorm, many passengers could do nothing but take the train.
A. had been canceled
B. have been canceled
C. were canceled
D. having been canceled
【答案】D。
【解析】独立主格结构做状语表示原因。
2. I don’t mind ____ the decision as long as it is not too late.
A. you to delay making
B. your delaying making
C. your delaying to make
D. you delay to make
【答案】B。
【解析】这是一个带有逻辑主语的动名词结构。依据前面所讲，逻辑主语应是一个带有形容词性的物主代词，其后的动词delay也应该是一个动名词。
3.______ from the outer space, our earth looks like a water-covered ball.
A. Having seen
B. Seeing
C. Seen
D. Having been seen
【答案】C。
【解析】根据分词结构的逻辑主语分析，选项A、B、D都不能和主句中的主语构成逻辑的主谓一致的关系。惟有选项C是正确答案。
4.They are going to have the service man ________ an electric fan in the office tomorrow.
A. install
B. to install
C. to be installed
D. installed
【答案】A。
【解析】have 之后的宾语如果是补足语的发出者时，则应使用动词原形。
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