下列哪个原因能引起噪音过大（）
A、配气或供油定时不对
B、进气系统短路
C、水箱堵塞
参考答案：A
— What did you do last Saturday, Alex ?
— Well , I ______to see a film , but in the end I stayed at home doing my homework. [ ]
A. was going
B. has gone
C. went
D. had gone
试述间接激励中间商的方法。
