谁用过You can speak fluent English in 45 days.说是哈佛最新研究成果.怎么样?

谁用过You can speak fluent English in 45 days.说是哈佛最新研究成果.怎么样? Now You Can Speak Fluent English Can you speak it in English为什么用speak Can you _____ it in English?用say 还是speak? Can you speak it in English改错 Can you speak in English改为祈使句 下面两个句子是否正确can you speak english?can you speak in english?是in Can you speak english? Can you speak （)English. Can you speak english, Can you speak English Can you speak/say jiaozi in English?到底用speak还是say啊?