_________that Marie was able to set up new branches elsewhere.    [ ]

A. So successful her business was    

B. So successful was her business    

C. So her business was successful    

D. So was her successful business

为了保证柴油机曲轴停在任何位置都能用压缩空气启动，则必须（）。

A．二冲程柴油机应不少于6个缸

B．二冲程柴油机应不少于3个缸

C．四冲程柴油机应不少于6个缸

D．四冲程柴油机应不少于4个缸