There is a factory near our school. Mr. Li has worked there【B1】then. Last November we visited the factory. We arrived【B2】a Satur

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问题 There is a factory near our school. Mr. Li has worked there【B1】then. Last November we visited the factory. We arrived【B2】a Saturday morning. Mr. Li welcomed us at the factory gate. He told us【B3】about the factory. Mr. Li told us【B4】the machines because they were dangerous. He was afraid we might hurt【B5】In one corner we saw cutting machines. These machines cut big pieces of metal into small pieces. In【B6】corner, we saw a big and【B7】machine. It【B8】different pieces of metal together. The workers there all【B9】thick clothes and glasses. We had a good time in the factory and we【B10】a lot of things.

选项 A、for
B、from
C、since

答案C

解析 考查介词词义辨析。since表示“自…以来”;from表示“从…”;for表示“在某段时间”。根据文章内容,C项符合题意。
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