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![单项选择。Both his parents look sad.Maybe they]( "单项选择。Both his parents look sad.Maybe they")
单项选择。Both his parents look sad.Maybe they
问题详情：单项选择。Both his parents look sad.Maybe they _________what's happenedtohim.Ａ. knew Ｂ. haveknown Ｃ. mustknow Ｄknow【回答】Ｂ知识点：动词时态题型：选择题...
