I enjoy my new life here. But I still miss my old friends from time to time. Here the underlined part means 　　　.

A．sometimes

B．at all times

C．always

D．Usually

在支架回撤的过程中，严禁使用（）环连接大链。

A.封闭钩

B.开口钩

C.钢丝绳

D.马蹄环