题目内容
【题目】China _____ a sharp increase in the number of Social Networking Services users in the past years.
A. has seen
B. saw
C. sees
D. was seen
【答案】A
【解析】“in/over/during/within the past/last+时间段”常和现在完成时连用. 句意。在过去的几年里,中国社会网络用户急剧增长。
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