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第四周，我们学习的重心是介词。 介词是一种虚词，一般放到名词前面，换而言之，名词作介词后的宾语，构成“介宾”结构。 首先来看介词的分类。 从形式上分类： 
An agreement seems to be impossible because the majority of the committee members are___ it. A.against B.for C.to D.with 后台对话框回复“看通介词”获取答案 昨日周测练习更新 With so many trees cut down,______ of the farmland in that district_____ become desert in the past 50 years. A. two seventh; has B. two seventh; have C. two sevenths; has D. two sevenths; have The____ child is only 1.2____tall. A. 13-year-old; meter B. 13-years-old; meters C.13-years-old; meter D. 13-year-old; meters The computer system crashed and I lost____ of work. A. three hour’s worth B. three hours’ worth C. three hours’ worthy D. three hour’s worthy More than two___years ago, people knew little about the univers. A. thousands B. thousand C. thousand of D. thousands of It is not rare in ____that people in ____ fifties are going to university for further education. A. 90s; the B. the 90s; / C. 90s; their D. the 90s; their 答案将在今日留言中放出 对话框回复“早安”和“晚安"，英语君为你送上暖心问候
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