.Mr. Black has been teaching English in a middle school _____ he came to China.

A．for ever

B．ever since

C．ever before

D．long before

首先倡导和平共处五项原则的国家是（）。

A.中国与前苏联

B.中国和印尼

C.中国与法国

D.中国与印度和缅甸