问题

It took several hundred years ______ paper-making spread to western countries
A:when
B:before
C:after
D:since
B:before
C:after
D:since
正确答案是:
同类题型
It is a surprise for me to see that theseold-fashioned machines are still ________ in the big city.
ano in the other shop will be _____,but _____.
_______the weather ,the sports meet will be held on time
Idon’t mind her criticizing me, but is how she does it that I object to.[ ]
The manager as well as his assistant _______ planning to go to Beijing