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    精英家教网 > 高中英语 > 题目详情
    China ______ a lot of people moving to urban areas in the last 20 years. However, many migrants  left their families behind.
    A．sawB．sees C．has seenD．had seen
    C

    试题分析：考查时态：句意：在过去的20年中中国见证了很多人搬到都市，然而，很多移民把家人留下了。时间状语是in the last 20 years表示从过去到现在一直在做的事情，用现在完成时，选C。
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