单项选择题

Only after half a year ______ to find the result of my experiment in his lab.

A. I begun
B. I had begun
C. have I begun
D. did I begin
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单项选择题
People are coming to understand that easy access to ______ is often the key to success in this highly developed society.
A. information
B. an information
C. the information
D. informations
单项选择题
It's better to avoid ______ downtown during the rush hour.
A. to drive
B. having driven
C. driving
D. to be driving
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