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    精英家教网 > 高中英语 > 题目详情
    To test _____ danger of not enough sleep caused by playing computer games, scientists did _____ experiment.

    A. a; /
    B. a; the
    C. the; an
    D. /; an
    C
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    科目：高中英语 来源：四川省模拟题 题型：单选题

    To test _____ danger of not enough sleep caused by playing computer games, scientists did _____ experiment.
    [     ]
    A. a; /
    B. a; the
    C. the; an
    D. /; an

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