问题
选择题
| ____ 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 |
答案
答案：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 |
答案：D