she told us that she would have a holiday when she had finished the design.

she told us that she would have a holiday when she had finished the design.

题目
she told us that she would have a holiday when she had finished the design.
为什么用"had finished",而不用"finished"?如果将前半部分变为"she tell us that she will have a holida",后边"finish"应该用什么格式?
答案
had finished 表示这个动作还没有执行 如果执行了就用finished
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