几道英语选择题,在下英语实在是烂T T

几道英语选择题,在下英语实在是烂T T1.We look forward only___a narrow path___to the top of the mountain.A.to seeing…leading B.to see...leading C.to seeing...lead D.to see...led 不是look forward doing sth.为什么选B?2.The sun warms the earth,____makes it possible for plants to grow.A.and which B.and what C.and that D.that 为什么选C?A和C有什么区别?3.Chemical processes___in the treatment of materials for clothes___the environment badly in some countries nowadays.A.involve...damaging B.involved...damaged C.involving...damage D.involved...damage 为什么选D?