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The canal must be wide enough to permit two of the largest boats using it to pass each other easily.It must be deep enough to leave about two feet of water（ ）the keel of the largest boat using the canal.
A.down
B.below
C.beneath
D.off
B.below
C.beneath
D.off
参考答案
参考解析
解析：beneath“在……以下（表示位置）”。A.down表示方向；B.below用于抽象概念；D.off则表示距离，不明指高低。
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