问题

The silk road, _______ Marco entered China, was important for the exchange of goods and ideas.

A:which
B:along which
C:after which
D:where

正确答案是：

同类题型

What’s in the pencil-box —________a pen in it.

___ pen is red and ___ is red, too.

Mom, I play computer games—Yes, you can. But you have to finish your homework first.

Have you read the book Oliver Twist— Who_______it

the front door ___ ,he had to enter the room through the back door