解析 句意为:18、19世纪见证了电的广泛传播和蒸汽引擎的诞生。some time witness sth.某时见证某事,所以选择D。
2.A policeman put some chemicals on the piece of paper,and a line of words
.
A.gave up
B.showed up
C.made up
D.stayed up
答案 B
解析 考查动词短语辨析。give up放弃;show up出现;make up弥补,化妆,编造;stay up熬夜。句意为:一个警察在纸上放了些化学药品,一行字就出现了。所以选B。
3.There are some health problems that,when
in time,can become bigger ones later on.(2017·浙江,19)
A.not treated
B.not being treated
C.not to be treated
D.not having been treated
答案 A
解析 句意为:有些健康问题,如果不及时处理,以后会变得更严重。when not treated in time为插入语,在本句中为时间状语从句,把that can become bigger ones later on这个定语从句给隔开了。when引导时间状语从句时,可以出现省略的现象,但必须满足两个条件:首先,时间状语从句中的主语必须和主句主语一致;其次,从句中含有be动词。本句中补充完整的状语从句为:when they are not treated in time,其他选项形式不对。故答案为A项。
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