____ 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
D
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____ 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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