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问题: 英语单选题

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

解答:

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