A．His girlfriend complained of his going to the party without her.
B．He was together with her girlfriend yesterday.
C．He has been busy dating his girlfriend these days.
D．He brought his girlfriend to the party.

A．Large modern cities are not good to live in.
B．Living in large modern cities has so many disadvantages.
C．All the simple, good things of life are imposed on the people who inhabit large cities.
D．Many things that are going on in nature are connected with large cities.