單項(xiàng)選擇題There are many cities（）very fast.
A.expand
B.which expand
C.which expanding
D.to expand
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1.單項(xiàng)選擇題Just over 70% of people（）for the survey said the net had become essential.
A.questioning
B.questioned
C.question
D.to question
2.單項(xiàng)選擇題There are often advertisements（）to other websites on the Internet.
A.lead
B.led
C.leading
D.to lead
