He didn’t know ______ is more difficult between maths and physics.

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问题 He didn’t know ______ is more difficult between maths and physics.

选项 A、which
B、that
C、where

答案A

解析考查从句连接词。填入的词作主句的宾语和从句的主语，且含有疑问意思，因此选which。注意that虽然也可作主、从句的主语和宾语，但它引出陈述句，不含疑问义。where只作从句的地点状语。

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