您好，请问下面这道题选什么？原因是什么？Robots used to ____workers in the factories often work under dangerous or poisonous conditions.A.take the place of B.taking the place of C.take place of D. taking place of
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此题考察 use 的几种用法。used to do 过去常（做）……be used to sth.\doing sth. 习惯（做）……be used to do 被用来（做）……take the place of 代替某人Robots used to ____workers in the factories often work under dangerous or poisonous conditions.在这个句中，used to ____workers in the factories 是过去分词作主语 Robots的定语，谓语是 work，所以应该是 A.take the place of
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A
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同意~
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同意dick的意见,因为在这里used to 不是指习惯做某事,而是指"过去常常"的意思!有时有以下的这种关系:take one's place =take the place of
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选A,take one's place 就位，就席，就座。 take the place of 代替某人，接替某人的位置。根据句意"在工厂里罗伯特常常接替那些在危险条件下工作的人."可知,此处为代替某人的意思,而且used在此为不及物动词〔用法同助动词，其后的不定式表示过去多次发生的动作〕常常，经常，往往。 I used to go there. 我(以前)常到那里。 He does not come as often as he used (to). 他不像从前那样常来了。所以答案为A.
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Robots used to ____workers in the factories often work under dangerous or poisonous conditions.A.take the place of B.taking the place of C.take place of D. taking place of 选A。理由：1、take the place of 取代...，代替...；在意义上满足要求；2、used 过去分词做定语，相当于一个省略的被动式定语从句，即：Robots (which are) used to ____workers in the factories ...这样就明白to是不定式符号了；
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选B used to doing 说明是习惯了什么的意识
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选A,take one's place 就位，就席，就座。 take the place of 代替某人，接替某人的位置。根据句意"在工厂里罗伯特常常接替那些在危险条件下工作的人."可知,此处为代替某人的意思,而且used在此为不及物动词〔用法同助动词，其后的不定式表示过去多次发生的动作〕常常，经常，往往。 I used to go there. 我(以前)常到那里。 He does not come as often as he used (to). 他不像从前那样常来了。所以答案为A.
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Robots used to _B.taking the place of ___workers in the factories who often work under dangerous or poisonous conditions.