He wont go back to Hong Kong next month. If he______to go back to Hong Kong, he______cours

He wont go back to Hong Kong next month. If he______to go back to Hong Kong, he______courses at Cornell Universitys Hotel School.

A．were, could not take

B．were, could have not taken

C．had been, could not take

D．had been, could have not taken

请帮忙给出正确答案和分析，谢谢！