a sofa made of real leather costs much more than__made of artificial leatherthis that one which

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a sofa made of real leather costs much more than__made of artificial leather
this
that
one
which

that

one
指代 a sofa

one

C-----one
真皮沙发比人造革的要贵多了

that
that指代沙发

that

that 作兼语 (主句的宾语, 从句的主语)