11．--- Do you have any idea why the bus – drivers are on strike? --- As far as I know the

问题补充：

11．--- Do you have any idea why the bus – drivers are on strike?

--- As far as I know, they area pay rise.

A. calling off

B. calling at

C. calling in

D. calling for

答案：

A. calling off

B. calling at

C. calling in

(答案→)D. calling for

解析：可联系答案网客服索取此答案。