Our modem civilization must not be thought of as _______

单选题 Our modem civilization must not be thought of as ________in a short period of time．

A．being created
B．to have been created
C．having been created
D．to be created

参考答案C

解析: C。我们不应该认为现代文明是在短时期内创造的。
考查非谓语动词。空格前为介词as，所以后面要使用动名词；同时，该动名词表示的动作发生在主句谓语动词前．而日动宾之间是被动关系．所以要使用动名词的完成被动式。

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

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