There was still the possibility that Lake Tanganyika and not Lake Victoria was the true ______ of the Nile.

A. source
B. resource
C. cause
D. course
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科目：高中英語 來源：同步題 題型：單選題

There was still the possibility that Lake Tanganyika and not Lake Victoria was the true ______ of the Nile.
[     ]
A. source
B. resource
C. cause
D. course

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