摘要： the most useful invention
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—What’s ______ most useful invention in the 20th century?
—______ computer, I think.
A. the, A B. a, A C. the, The D. /, The
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—What’s _____most useful invention in the 20th century?
—_____ computer, I think.
A. the, A B. a, A C. the, The D. /, The
查看习题详情和答案>>