Historically, _______ main material for making tables has been wood, but ______ metal and stone have also been used.<br />A. the; /　<br>B. /; /<br>C. the; the <br>D. /; the

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

出自：国家开放大学英语语法

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