1。faced 后接by or with?
都可以呀..
sth. faced by sb. 例如: It's a great deal of difficulty faced by him.
sb. faced with sth. 例如: He has never been faced with such difficulty.
2.discussion 和 regarding 是可数名词吗？
discussion 可以用做可数名词.. 而regarding 根本就不是个名词..
3 evidence concerning 后跟什么？可以是whether 从句或that 从句吧？ evidence concerning 后面跟宾语或宾语从句.. whether或that 从句都是可以的, 具体用哪个视情况而定 | 
