— can I get to the post office?— Go down this street and turn left.A. WhereB. WhatC. HowD

问题补充：

— can I get to the post office?

— Go down this street and turn left.

A. Where

B. What

C. How

D. When

答案：

A. Where

B. What

(答案→)C. How

D. When

解析：Where在哪儿；What什么；How如何，怎样；When什么时候。根据下文，沿着这条街前行，然后左转。可知上文问的是，我怎样才能到达邮局？故选C。