— Is it my age ______the boss minds?

—I’m afraid so. He will consider ______ necessary to have an experienced assistant.

A．which；it

B．that；it

C．which；that

D．that；that

水压试验的压力设置（）。

A、因设备而异

B、由施工作业人员决定

C、按有关规定执行

D、无明确规定