人力资源与物质资源不同，物质资源经过一定加工后就成为最终产品，而人力资源在开发使用后可以继续开发。这体现了人力资源的（）特性。

A、能动性

B、社会性

C、开发的连续性

D、再生性

The old man who()in the deserted house alone tbr ten years has been settled in a nursing home now.

A. lived

B. had lived

C. has lived

D. has been living