Let's practice____together. A.sing B.to singLet's practice____together.A.sing B.to sing C.singing D.sings填哪个?为什么?谢谢各位大神了!

Let's let's Let's Let’s let's let 's Let's let's Let's LeT'S let's let's Let's Dance,Let's Dance,Let's Dance 歌词 Let's Play! Let's play a let’s play! Let's-play-together. 英语Let's count