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Historically, _____ main material for making tables has been wood, but _____ metal and stone have also been used.

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

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

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

Historically, __________main material for making tables has been wood, but__________metal and stone have also been used.

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

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