【題目】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+時(shí)間段”常和現(xiàn)在完成時(shí)連用. 句意。在過(guò)去的幾年里，中國(guó)社會(huì)網(wǎng)絡(luò)用戶急劇增長(zhǎng)。

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