下列带有通配符的文件名中，能代表文件ABCDEF.DAT的是( )。
A．A*.*
B．F*
C．*．
D．AB.*
参考答案：A
白炽灯泡具备哪些特征则可认定曾经通电？
His father _____ to Nanjing. He _____ back next week.
A. has been, is B has been, will be C. has gone, is D. has gone, will be
