作业帮科普英语阅读里的两道题1.……Right after the movie theaters,the government buildings in Washington D.C.were air-conditioned,( )the US House of representatives building,the Senate building,even the White House.……A.started withB.startin
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科普英语阅读里的两道题1.……Right after the movie theaters,the government buildings in Washington D.C.were air-conditioned,( )the US House of representatives building,the Senate building,even the White House.……A.started withB.startin
科普英语阅读里的两道题
1.……Right after the movie theaters,the government buildings in Washington D.C.were air-conditioned,( )the US House of representatives building,the Senate building,even the White House.……
A.started with
B.starting with
为什么答案是A不是B?
2.……By the fourth century B.C.an abacus was used for calculating……
An abacus has begun to( )
A since the fourth century B.C.
B before the fourth century B.C.
为什么答案是A不是B?
漏打了……An abacus has begun to be used
2.by的具体意思是？
科普英语阅读里的两道题1.……Right after the movie theaters,the government buildings in Washington D.C.were air-conditioned,( )the US House of representatives building,the Senate building,even the White House.……A.started withB.startin
1.非谓语动词start和句子主语the government buildings之间是被动的关系,所以用过去分词形式started.
此时start不翻译为“开始”,而译为“始建”.
2.since引导介宾短语做句子时间状语时,该句才会使用现在完成时（has begun to）；
用before引导的话,则表示具体的一个过去时间状语,句子一般用一般过去时或过去完成时.
3.By the fourth century B.C.到公元前4世纪时
by的意思是“到...的时候”
1 与后面的是被动关系吧。Building 是不会start 的
2 前面是BY 从公元前四世纪以来，所以选A B是只之前，文章意思是说公元前四世纪之后怎么怎么