（）是社会和谐的前提，这是社会主义最本质的规定，是核心中的核心。
A.共同发展
B.共同富裕
C.共同进步
D.贫富均分
参考答案：B
But for the sudden rainstorm, our trip to Hong Kong _____ a very pleasant one.
A．was
B．would have been
C．would be
D．had been
Go downstairs, stand in line on the playground as soon as possible.
A．and
B．but
C．so
D．or
