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what is thatwhat is that( ) ( )It is a tennis ball.Let us play( )That( ) ( But I( )have( ) ( )Well,( ) ( )ping-pong.OK. Is it the letter (that) you got yesterday (that) makes you so sad为什么括号内要填thatwhat which不行吗？不用翻译，能不能解释地具体点， What is what is what is? what is What is what is what is what is what is what is what is what is what is What is What is what is