—On the radio，billboards，TV and so on，there are a variety of ads，_______are bad ones．You should be careful．
—Thank you，I will．
A．some of them B．few of those
C．some of that D．some of which
—On the radio，billboards，TV and so on，there are a variety of ads，_______are bad ones．You should be careful．
—Thank you，I will．
A．some of them B．few of those
C．some of that D．some of which
D