Gemerally,air is heavily polluted _______ there are factories.A)where B)when C)if D)whether

Gemerally,air is heavily polluted _______ there are factories.A)where B)when C)if D)whether hea hea的hea是什么意思 hea的hea是什么意思 The air is what is air There is air c_____. There is air e____. There is( )air-conditioner. The air is c( ) what is air resistance hea是什么意思 hea是什么意思? hea是什么意思? 用英语单词组成一句话用 unhappyily she what mad at he did that so she was left 组成一句话还有 problem is computer with you tell a there the us to welcome are和 room sea i looks a whose like over would out the window和 think air hea I heard heA is going abroadB will go abroadC was going abroadDhas gone abroad Moving air is c_________ wind. the air is still是什么意思