He was medical student before he turned engineer. A. a; an B. the; the C. a; ——青夏教育精英家教网—

摘要： He was medical student before he turned engineer. A. a; an B. the; the C. a; / D. /; an

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He was ______ medical student before he turned _______ engineer.

A. a; an B. the; the C. a; / D. /; an

He was ______ medical student before he turned _______ engineer.

A. a; an B. the; the C. a; / D. /; an

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