单项选择题

So fast()that it is difficult for us to imagine its speed.

A. light travels          
B. travels light<br>
C. do light travel   
D. does light travel

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单项选择题
()any instructiorts from the Head Office, we couldn’t make any decision.

A. Not receiving
B. Receiving no
C. Not having recived
D. Having not received
单项选择题
As people live longer, they()to change their ideas about life

A. like
B. tend
C. wish
D. long
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