--was your last summer vacation?--It was great.A. HowB. WhenC. WhatD. Where

问题补充：

--was your last summer vacation?

--It was great.

A. How

B. When

C. What

D. Where

答案：

(答案→)A. How

B. When

C. What

D. Where

解析：你上个暑假怎么样？很棒。A怎么样；B什么时候；C什么；D哪里；根据题意选A。