Whenhesawallhisbooks的知识精选

Whenhesawallhisbooks
问题详情:Whenhesawallhisbooks_____hereandthereonthefloor,heknewthatsomethingterrible_____.A.lying;musthavehappenedB.lie;musthappenC.lay;mighthavehappenedD.hadlain;couldhavehappen【回答】A知识点:动词时态...
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