关于独立主格的题
On the top was the clear outline of a great wolf sitting still,ears（ ） ,alert,listening．
A．pointed B．pointing C．are pointed D．are pointing
这个题我选B,
with all factors（ ）,we think this program may excel all the others in achieving the goal．
A．being considered B．considering C．considered D．are considered
这个题我选A,
麻烦有没有谁能给我解释一下为什么?