问题描述：
Most students in China learn English at school.(English是划线部分,对它提问）应是what还是which
Most students in China learn English at school.(English是划线部分,对它提问）应是what subject do most students in China learn at school?还是which subject do most students in China learn at school?
为什么
Most students in China learn English at school.(English是划线部分,对它提问）应是what subject do most students in China learn at school?还是which subject do most students in China learn at school?
为什么
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