Notonlyhisparentsbutalsohisbrother

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Not only his parents but also his brother ________ to the Summer Palace. They haven’t been back.

A. have been B. have gone C. has been D. has gone

解析：该题考查的是主谓一致。如果由not only…but also连接两个并列主语，其谓语动词同相邻的主语保持一致，谓语动词应用单数形式。又因为他们还都没有回来，所以用has gone而不用has been。