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工作学习 / English / 选择：... sugery ___ his left knee
on
in
of
at
-kevinxin(Kevinxin);
2003-2-7
{46}
(#1026195@0)
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on, of 都可以。看上下文。
-noexit(江湖▲夜雨▲省油▲灯);
2003-2-7
(#1026199@0)
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是on. 不是of. 通常说 knee surgery. 但不是 surgery of knee. 例如：Earl Holmes has surgery on his knee.
Earl Holmes undergoes knee surgery.
-kevinxin(Kevinxin);
2003-2-7
{75}
(#1026206@0)