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

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

1. A.
   the; the
2. B.
   the; /
3. C.
   /; the
4. D.
   /; /

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;不填          B．a(chǎn); 不填            C．the; the         D．不填；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