.

Joe’s_______ in the get-together surely brought us a lot of pleasure as he is a man with a

strong sense of humour.

A．joining

B．having been joined

C．joined

D．had joined

胶料在存放过程中必须（），以避免焦烧

A、控制温度和缩短存放时间

B、地面平整度

C、周围环境

D、是否是空调房间