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一道英语选择题的疑问,为什么选A不是选择B.

来源:学生作业帮 编辑:作业帮 分类:英语作业 时间:2024/07/08 17:54:24
一道英语选择题的疑问,为什么选A不是选择B.
The first thing you should have learned at collage is to work on your own. it's time you ( ) able to manage your time.
A: Were B: should be
正确答案是A
可是不明白为什么不是选择B
请告诉:为什么选择这个答案的理由.谢谢
it's time (that)主语+did...
it was time (that)主语+had done..是做某事的时候了,虚拟语气.和现在相反,用上一个,和过去相反,用下一个.