alarm clock and pen are on the computer desk. A. An, a B.A, an C.A, a D——青夏教育精英家教网—

摘要： alarm clock and pen are on the computer desk. A. An, a B.A, an C.A, a D. \.an

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_______alarm clock and ______ pen are on the computer desk.

A. An ; a B. A; an C. A; a D. An; an

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