问题补充：
After they stars in their own country, the Beatles the United States.
A. had become; toured
B. have become; toured
C. became; toured
D. became; had toured
答案：
(答案→)A. had become; toured
B. have become; toured
C. became; toured
D. became; had toured
解析：句意：甲壳虫乐队在自己的国家成名后，他们开始去美国巡回演出。“成名”在“巡回演出”之前，而“巡回演出”已经是发生在过去的事情，表示过去的过去，用过去完成时，选A。
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