问题

Silk_________ one of the primary goods traded along the Silk Road by about 100 BC.
A:had become
B:wasbecoming
C: .has become
D:isbecoming;
B:wasbecoming
C: .has become
D:isbecoming;
正确答案是:
同类题型
A new ________ bus service to Yangzhou-taizhou Airport started to operate two months ago.
It’s a long timewelast met. How is everything going—Well, I am living a happy life.
The movie is _________ moving _________ we all cry.
everything to go wrong in advance,___ you may feel quite so bad when it does.