问题

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

正确答案是：

同类题型

I am very sleepy. I tried _______my eyes open, but I couldn’t.

an we move into our new house this weekend—No, it _________.

How are you managing to do your work without an assistant?— Well, I ______ somehow.[ ]

you like to enjoy the ballet performance at the Grand Theatre with us—Oh, sorry. I ____to see the film Interstellar by Christopher Nolan.

__________ do I have tochange the robot’s batteries —Every two months.