单项选择题
A．In case B．As long as C．Even if D．As far as
Because of the reduction of air pollution, this city no...
单项选择题Because of the reduction of air pollution, this city now is a good place（）.
A．where to live B．which to live C．to live in D．to be lived
Criticism and self-criticism is necessary（）it helps us ...
单项选择题Criticism and self-criticism is necessary（）it helps us to find and correct our mistakes.
A．for that B．at that C．with that D．in that
A man escaped from the prison last night. It was a long...
单项选择题A man escaped from the prison last night. It was a long time（）the guards discovered what had happened.
A．before B．until C．since D．when
