若铺填完各层反滤料后未能达到（），将上层填料拆除，再按层次加厚。
A.截断渗流
B.某固定高度
C.制止涌水带沙的效果
D.堵住出水
参考答案：C
—Mum, is the pair of gloves mine?
—Yes. You have to wear another pair.
A．washing
B．have washed
C．having washed
D．being washed
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