单选题______ApaceBsurfaceCrateDlevel
单选题
______
A
pace
B
surface
C
rate
D
level
参考解析
解析：
词语搭配题。此处所填之词是个名词，参考上题给出的句意；所以此处为at a proper level。
词语搭配题。此处所填之词是个名词，参考上题给出的句意；所以此处为at a proper level。
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