did you visit the Science Museum? --Three months ago.A. WhenB. WhereC. WhatD. Which

问题补充：

-- did you visit the Science Museum?

--Three months ago.

A. When

B. Where

C. What

D. Which

答案：

(答案→)A. When

B. Where

C. What

D. Which

解析：考查疑问词的用法。When当……时候，Where哪里，What什么，Which哪一个，根据答语是过去具体时间，用when来提问。所以选A。