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It’s quite normal to ten percent of the cost of a building for a period of six m

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It’s quite normal to ten percent of the cost of a building for a period of six m

It’s quite normal to___ ten percent of the cost of a building for a period of six months or so, in case faults are found in it.

A. keep up   B.  keep away   C. keep off    D. keep back 

试题答案

D