why does the lake smell terrible?because large quantities of water ——A.have polluted B.is being polluted C.has been polluted D.have been polluted这里主语为什么是quantities?不应该是water吗?到底应该选哪个?

Why does the lake smell terrible?Because large quantities of water( )a have polluted b is beingpolluted c has been polluted d have been polluted 选什么? why does the bird fly Why does he throw the apples away? why does the man lose his Why does the boy think that? Why does the Earth move?Why does it rotate around the Sun?Why does it spin anticlockwise? why does the star go on shining?why does the sea rush to the shore? why does the wind blow?如何划分句子why does the wind blow?如何划分句子成分 连词成句summer,because,swim,you,i,can,in,why,the,like,lake,do(?/.) it is so hot today ,so why not ___(swim) in the lake? 选哪个,请给出原因.In that vast desert ______,which really is a wonder of the natureA.lies a large lake B.a large lake lies C.does a large lake lie D.lying a large lake why does the boy tell the lie 翻译 Why does the policeman run after the young man?回答 Why does the boy look at the elephant是什么意思 What does the fox say?能去掉does吗额,What does the fox say?的does可以去掉吗?Why? why does the little Water Drop fall?怎么回答 why does the little Water Drop fall?怎样用英语回答 Why does Tom throw butter out of the window?