13.It suddenly occurred to him ________ he had left his keys in the office.
A. whether B. where C. which D. that
【答案】D。解析:考查主语从句, It为形式主语,that引导的从句为真正的主语。句型It occurs to sb. that…“某人突然想到。”因此D为正确答案。
14.By reading the article, we know how ______ in our daily life.
A. will we protect the earth B. we can reduce pollution
C. should we save water D. we must recycle things
【答案】B。解析:考查宾语从句, 宾语从句的语序是陈述句语序,所以AC先排除,B的意思是通过读这篇文章,我们知道在我们的日常生活中可以如何减少污染,D选项的意思是我们必须循环利用东西,与空前“how如何”连用不通顺。根据句意的通顺来判断,B为正确答案。
15.A paper plant is __________ paper is made.
A. which B. where C. what D. in which
【答案】B。解析:考查表语从句,句意:纸厂就是纸被制造的地方,系动词后为表语,所以此处is后面是表语从句,在从句中不缺少成分,所以可以加上状语,D选项不能引导表语从句,which和what作主语、宾语、表语,不作状语,where做状语,故B为正确答案。
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