China ( )a sharp increase in the number of aged people over the past decadeA sees Bsaw Cwill see D has seen还望解释哈

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China ( )a sharp increase in the number of aged people over the past decadeA sees Bsaw Cwill see D has seen还望解释哈

China ( )a sharp increase in the number of aged people over the past decadeA sees Bsaw Cwill see D has seen还望解释哈
China ( )a sharp increase in the number of aged people over the past decade
A sees Bsaw Cwill see D has seen
还望解释哈

China ( )a sharp increase in the number of aged people over the past decadeA sees Bsaw Cwill see D has seen还望解释哈
D
这是个一般完成时,over the past decade,是一个标志.