―Where are the children? The dinner’s going to be completely ruined.( ) ―I wish they ______ always late. A. weren’t B. hadn’t been C. wouldn’t be D. wouldn’t have been 答案:A 如图是一个复合门电路,由一个x门电路与一个“非”门组成,若整个电路的作用成为一个“与”门,则x电路应该为
[ ]A.“与”门 B.“与非”门 C.“或”门 D.“或非”门