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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.

单选题
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.

Adown

Bbelow

Cbeneath

Doff

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