With the development of the central and western China，more and more modem cities have

——in what was a wasteland ten years ago

A．built-up

B．sprung up

C．grown up

D．risen up

解释对方说话的意思的时候，一般不要采用（）的方式表达。

A、直接

B、探寻

C、反问

D、委婉