The efficiency of coal-charging machine is very high, ______, 1 500 tons of coal

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问题 The efficiency of coal-charging machine is very high, ______, 1 500 tons of coal per hour.

选项 A、say
B、saying
C、said
D、to say

答案 A

解析 say在此处的作用相当于for example"也就是、即、比如说"，可以理解为let’ssay。如：Shall we start sometime later this week，say，Friday?"我们是不是在本周中的晚些时候再出发?星期五怎么样?"

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