He is actually racing with time, for these structures are all the while undergoing a steady and unco

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He is actually racing with time, for these structures are all the while undergoing a steady and uncompromising process of disintegration. (Unit 1:In Search of Ancient Chinese Architecture)The steady and uncompromising disintegration of these structures is caused by the following factors EXCEPT ().

A.the application of more easily perishable construction materials

B.people's intention to modernize the ancient Chinese architecture

C.unexpected ups and downs in the field work to study the ancient Chinese architecture

D.nature's effect on the structures

参考答案:

答案:unexpected ups and downs in the field work to study the ancient Chinese architecture