问题

When first _______ to the market, the products didn’t attract much attention.
A:introducing
B:introduced
C:was introduced
D:being introduced
B:introduced
C:was introduced
D:being introduced
正确答案是:
同类题型
What shall we do after finishing our homework—How about __________music
u think Allan came by taxi– No. If he had, I don’t believe he ______his bike here.
These two books are very interesting. Youcan choose _________ of them.
29.Don’t touch anything.Better leave things_________they are until the police arrive.