OMD单板是通过什么口进行级联的（）
A、CH0
B、LINE
C、UPG
D、OSC
参考答案：C
Tommy had had a three-mile drive north _____ he could turn and head back south.
A．while
B．as
C．before
D．after
依法治国是现代社会的重要标志。 ( )
