the robots have been sent to repair the damaged nuclear power station in Japan

the robots have been sent to repair the damaged nuclear power station in Japan

题目
the robots have been sent to repair the damaged nuclear power station in Japan
It was the first time that the robots __have been sent____________ to repair the damaged nuclear power station in Japan.横线处为什么用现在完成时?
横线处改为 had been sent
不好意思打错了
答案
举一反三
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想找英语初三上学期的首字母填空练习……
英语翻译
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