____ computer, which was invented in the 1950s, is widely considered as ____ useful tool in modem society.

A. The; an
B. A; the
C. /; an
D. The; a
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科目：高中英語 來源：模擬題 題型：單選題

____ computer, which was invented in the 1950s, is widely considered as ____ useful tool in modem society.

[     ]

A. The; an
B. A; the
C. /; an
D. The; a

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