What's the matter______ they still haven't answered the telegram?填了that,

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What''sthematter______theystillhaven''tansweredthetelegram?填了that,What''sthematter______theystillhaven''

What's the matter______ they still haven't answered the telegram?填了that,
What's the matter______ they still haven't answered the telegram?填了that,

What's the matter______ they still haven't answered the telegram?填了that,
that 引导的同位语从句,问他们还没回电报这事怎么了