A．一定串联
B．一定并联
C．串联和并联都有可能
D．串联和并联都不可能
答案：C
Today's English learners have a wide choice of dictionaries ____to choose.[ ]
A. from which
B. in which
C. for which
D. of which
正确开展批评和自我批评，做到（）相结合。
A.德治与法治
B.褒扬与惩处
C.自律与他律
D.德育与智育
