一般家用乘用车最常见的发动机位置及驱动方式为（）
A.前置后驱
B.前置前驱
C.后置后驱
D.中置后驱
参考答案：B
— I wonder if you can go shopping with me together.
— Sorry. I _____ a letter all the morning and haven't finished it yet. [ ]
A. am writing
B. was writing
C. have written
D. have been writing
如果区位内上市公司的主营业务符合当地政府的产业政策，一般会获得诸多政策支持，对上市公司的进一步发展有利。( )
