That all______is made up of cells is a unifying concept in modern biology.A、livi

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问题 That all______is made up of cells is a unifying concept in modern biology.

选项 A、living material
B、material is living
C、material has lived
D、which material lives

答案 A

解析 The first clause, a noun clause, needs a subject; living material is a noun phrase with an active-voice participial adjective.

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