作业帮是he have served in army from 1952 to 1957还是he was in army from…
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是he have served in army from 1952 to 1957还是he was in army from…
是he have served in army from 1952 to 1957还是
he was in army from…
是he have served in army from 1952 to 1957还是he was in army from…
若后面用from 1952 to 1957,应该用he was in army ,用现在完成时语法上不对
下面这一个he was in army from…
he was in army from…单纯过去时
为什么？还有一个问题，1970s代表的是70年代，但是前面加the 吗？ 加啊，固定用法 in the 1970s或者 in the 1970's都可以 不用加~`