单项选择题
W: Is this the bus that goes by the mall M: No, it isn’t. But you can transfer from this bus to bus number 24.
A.Take the bus. B.Walk to the mall. C.Take bus No. 24. D.Take a tax
A. introducing B. being introduced C. to be introduced D. introduced
A. mustn't B. couldn't C. wouldn't D. shouldn't