Much___to fight against pollution.A.have been done B,has been done C,had been done D.has done为什么是选B?

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Much___to fight against pollution.A.have been done B,has been done C,had been done D.has done为什么是选B?
Much___to fight against pollution.A.have been done B,has been done C,had been done D.has done
为什么是选B?

Much___to fight against pollution.A.have been done B,has been done C,had been done D.has done为什么是选B?
much是不可数名词,后面接单数形式,同时,全句意思是：为治理污染,（到现在为止）,已经做了很多的事.所以用现在完成时态,且,事情是“被做”,所以要用被动语态.

Much___to fight against pollution.A.have been done B,has been done C,had been done D.has done为什么是选B? fight fight fight fight fight fight fight!fight! i have much___to do.A.work B.exercise Don't be late agai反义疑问句 fight a fight 是什么意思 Fight 短语fight + prep.+ . Fight dog,fight bear. Fight Fight Fight (Hurt Bleed Cry) 歌词 fight是什么意思 Fight the fight for fight是什么意思