the robots have been sent to repair the damaged nuclear power sta_英语解答

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

人气：183 ℃　时间：2019-10-10 04:54:15

解答

had been sent是对的.it was the ,time that 用过去完成时.改为 were sent 可以吗这是固定的。如果前面是一般现在时就用现在完成时。