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：高中英語 來源：四川省模擬題 題型：單選題

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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