单项选择题
A．did his father come in, the boy began B．did his father come in, did the boy begin C．his father came in, the boy began D．his father came in, did the boy begin
A．He feels lucky. B．He feels awful. C．He feels unforgettable. D．He feels tire
A．Taking four courses is better. B．Taking one course is better. C．Taking five courses is better. D．Taking more courses is better.