These powerful ______ machines are often used by those accountants.

A.calculate
B.calculator
C.calculation
D.calculating
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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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