问题描述：
单项选择,要写原因（重点原因）Lina gets a high mark
Lina gets a high mark（）chinese in this exam.
---Yes!her best()is chinese
A.in,job B.on,exam C.of,sport D.on,subject
Lina gets a high mark（）chinese in this exam.
---Yes!her best()is chinese
A.in,job B.on,exam C.of,sport D.on,subject
问题解答：
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