英语选择题、请说明理由~

英语选择题、请说明理由~We'll go on a field trip if it _______ this weekend.A.won't rain B.isn't raining C.doesn't rain\x05D.not rainBeijing is one of _____ in the world.Millions of visitors come to visit Beijing every year.A.beautiful cities B.most beautiful cityC.the most beautiful city D.the most beautiful cities.Jenny goes to school ________ than any other student in her class.A.early B.earlier C.earliest D.the earliest