The fearless pirates kept _______ on the waters off the coat of Somalia, from the Gulf of Aden to the Kenya border along the Indian Ocean.
| A．knocking on | B．knocking down |
| C．knocking about | D．knocking at |
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The fearless pirates kept _______ on the waters off the coat of Somalia, from the Gulf of Aden to the Kenya border along the Indian Ocean.
| A．knocking on | B．knocking down |
| C．knocking about | D．knocking at |
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