恳请老师解答 let's play ping-pong ping-pong后面为什么不

Let's play ping-pong. Let's play ping-pong.____ good? let's play ping-pong now. let's play ping-pong 做肯定回答 Let's play the ping-pong.哪错了 Let's play the ping-pong together 哪错了? Let’s play ping-pong together 该回答什么 A:Let‘s play ping-pong.B:No,_____________. Let us play a ping-pong together. play ping-pong Let's piay ping-pong 回答 ping-pong