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题目内容
（国家开放大学英语语法）
Historically, _______ main material for making tables has been wood, but ______ metal and stone have also been used.
A. the; /
B. /; /
C. the; the
D. /; the
A. the; /
B. /; /
C. the; the
D. /; the
参考答案