We all know that ancient people also counted ______ tens.

A．in
B．on
C．with
D．by
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科目：初中英語(yǔ) 來(lái)源：0109 期中題 題型：單選題

We all know that ancient people also counted ______ tens.
[     ]
A．in
B．on
C．with
D．by

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