These powerful ______ machines are often used by those accountants.

A．calculate
B．calculator
C．calculation
D．calculating
D
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科目：初中英語(yǔ) 來(lái)源：0109 期中題 題型：單選題

These powerful ______ machines are often used by those accountants.
[     ]
A．calculate
B．calculator
C．calculation
D．calculating

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