Apples are sweet at fall.和Apples are sweet in fall.哪个是对的

Apples are sweet at fall.和Apples are sweet in fall.哪个是对的 Apples are sweet on fall.怎么改 Apples are sweet _______ fall.A.on B.in C.at THESE apples are sweet感叹句 I like apples because they are sweet 对because they are sweet Apples are sweet and yummy?汉语是什么? These apples are awfully sweet.不对为什么? are,sweet,the,apples(?) 连词成句 The apples are sweet.改为一般疑问句 The apples are sweet and yummy.(感叹句) I like apples .They are sweet.问句是? these apples are sweet改为用what引导的感叹句