对画线部分提问(Tom was playing ping-pong when l left.)Tom was playing ping-pong when l left.-------------------- ----- Tom ----- ping-pong?关键是时态啊,用while还是when?

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对画线部分提问(Tom was playing ping-pong when l left.)Tom was playing ping-pong when l left.-------------------- ----- Tom ----- ping-pong?关键是时态啊,用while还是when?
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对画线部分提问(Tom was playing ping-pong when l left.)Tom was playing ping-pong when l left.-------------------- ----- Tom ----- ping-pong?关键是时态啊,用while还是when?
对画线部分提问(Tom was playing ping-pong when l left.)
Tom was playing ping-pong when l left.
--------------
------ ----- Tom ----- ping-pong?
关键是时态啊,用while还是when?

对画线部分提问(Tom was playing ping-pong when l left.)Tom was playing ping-pong when l left.-------------------- ----- Tom ----- ping-pong?关键是时态啊,用while还是when?
When was playing\
不用while来提问