问题补充：
Bill with his parents China since two years ago.
A. have been in
B. have gone to
C. has been in
D. has been to
答案：
A. have been in
B. have gone to
(答案→)C. has been in
D. has been to
解析：
句意：比尔和他的父母两年前已经来到中国了。本题考查两个知识点。第一，句子的主语，第二，have/has been to 、have/has gone to 、have/has been in的用法。本题主语是Ben ,with his parents 是介词短语，修饰主语Ben，故谓语动词应用第三人称单数形式；have/has been to表示“去过某地（人已经回来）”，have/has gone to表示“去了某地（人未回来)”have/has been in表示处于某种状态。根据句意，比尔和他的父母来到中国的状态已经持续两年了。故选C。
