it is best to exercise twice a week中 best 为什么不加the

it is best to exercise twice a week中 best 为什么不加the To exercise twice every week is best.(改为同义句） it is best to 的best前面为什么不用the? 为什么I think the best way to relax is through exercise中填throug Put the picture where light is best这里BEST为什么不加THE呢 is the best way （to） keep healthy中healthy为什么前面要加to The best way_to keep_healthy is to exercise every day. He thinks the best way to relax is t___ exercise. I like English best ,best前为什么不加 the I like basketball best.Best前为什么不加the? spring is the best season to plant trees这句句子中为什么不用加介词? It is best to do sth.为什么best前没有the?