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

試題分析：考查時態(tài)：句意：在過去的20年中中國見證了很多人搬到都市，然而，很多移民把家人留下了。時間狀語是in the last 20 years表示從過去到現(xiàn)在一直在做的事情，用現(xiàn)在完成時，選C。
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