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youngTommyPopperlooksforwardtothemomentswhen,(这里什么句型,为什么when后面是逗号?)onhistiptoestoreachahamradioinhisbedroom,hecantalktohisworld-travelingfather.

题目详情
young Tommy Popper looks forward to the moments when,(这里什么句型,为什么when后面是逗号?)on his tiptoes to reach a ham radio in his bedroom,he can talk to his world-traveling father.
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答案和解析
状语从句,when he can talk to his world-traveling father,而 on his tiptoes to reach a ham radio in his bedroom只是插入语.