问题

He has been in the USA .
A:since a month
B:for a month
C:for a month ago
D:in a month
B:for a month
C:for a month ago
D:in a month
正确答案是:
同类题型
Isoxygentheonlygas______helpsfireburn? [ ]
_____ and see a film this afternoon?—That’s a good idea.
Mr. Greento the manager now. You’d better call him later.
As a result of the fight, Jim was in ________ prison for ________ years.
_____ is no doubt _____ Jennifer will come to see me this weekend as usual.