问题
Experts have been warning _____ of the health risks caused by passive smoking[ ]
A: at a time
B: at one time
C: for some time
D: for the time
B: at one time
C: for some time
D: for the time
正确答案是：
同类题型
It is very ______ that she will ring metonight.
Oh, I______your camera. Is it all right if I bring it to you tomorrow? —All right.
ane is lucky to have got the well-paid job.一Yes, ＿＿she is inexperienced and young.
We plan to go out for a picnic next weekend. Would you like to come along— ______. It’s my favorite.