邓 * * 理论的首要问题是：什么是社会主义、怎样建设社会主义。( )
参考答案：对
Never______ such a difficult problem. It took me almost half an hour to work it out.
A．had I come across
B．I had come across
C．did I come across
D．I did come across
该企业2005年应纳房产税( )万元。
A．34.988
B．33.84
C．33.588
D．35.24
