应该选哪一项?为什么应该选哪一项?请讲出理由1) I still don't know what ____ while
1个回答
1.A,从句是过去时,主句过去完成时.
2.A,同样,从句过去完成时,主句过去进行时.
3.A,看到SINCE,标志着完成时
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