乘车英语对话-On a Wrong Bus(3)

A: Are you sure you know where this bus goes?
B: It should go to Altadena.
A: What do you mean it should?
B: I'm not completely¹ sure if it really does.
A: Dude, are we on the right bus?
B: I'm almost positive that this is the right one.
A: It doesn't look like we're on our way to Altadena.
B: We have been riding this bus for a long time.
A: What does that sign say?
B: I think it says Temple City.
A: Yup, I'm never trusting you with the bus schedules again.
B: I'm sorry. But at least we know which bus to catch to get back where we started.

1 completely   

adv.完全地，十分地，全然

参考例句：

• She never completely gave up hope.她从不完全放弃希望。
• I feel completely in the dark on this question.这件事使我感到茫然。