When Jane fell offthe bike, the other children_____

单选题 When Jane fell offthe bike, the other children______

A．were not able to help laughter
B．could not help but laughing
C．could not help laughing
D．could not help to laugh

参考答案C

解析: C。简从自行车上摔了下来，其他孩子忍不住笑了起来。
考查情态动词。caIl’t／couldn’t help doing sth．意为“忍不住做某事”。

单选题 It's the first time that she has been to the United States,_____?

A．isn't she
B．hasn't she
C．isn't it
D．hasn't it

单选题 All flights______ because of the snowstorm, we decided to take the train．

A．were canceled
B．had been canceled
C．having canceled
D．having been canceled

单选题 There is a real possibility that these animals could be frightened, ______a sudden loud noise．

A．being there
B．should there be
C．there was
D．there having been