（2014年(春)重庆市高三考前冲刺测试卷）5.  Traditionally __ as one of the safest planes, the Boeing 777's reputation has been damaged by the second crash in less than a year.

A．to be regarded

B．regarded

C．having been regarded

D．regarding

烧菜时，又加酒又加醋，菜就变得香喷喷的，这是因为（）

A.有盐类物质生成

B.有酸类物质生成

C.有醇类物质生成

D.有酯类物质生成