问题: 求救，一道英语单选
It's quite normal to ____10% of the cost of a building for a period of six months or so,in case faults ate found in it.
A.keep up B.keep away C.keep back D.keep off
解答:
正确答案是C我做过
A是保持
B是远离
C是苛扣
D是别碰
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