问题详情

Which of the following prepositional phrases is an adverbial of cause？

A．Don"t stay away on John"s account.

B．He said it for fun, but they took him seriously.

C．With all his boasting, Robert achieved very little.

D．You mustn"t cross the road against the red light.

请帮忙给出正确答案和分析，谢谢！