【正文】
must have been doing:表 boy______ ______ (prevent) from climbing up the tree just now. was prevented。句意為:剛才阻止了那個男孩爬樹。 (完成句子 ) Tom_____ ______ _______ _________basketball. must have been playing。 課后評價方案 1. 2b。 think the stones can prevent illness and keep people 認為這些石頭可以