at the age of 与by the time of 与at that time后面分别加什么时态?

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at the age of 与by the time of 与at that time后面分别加什么时态?

at the age of adv.在...岁
She graduated from the high school at the age of 18.
by the time是过去完成时的标志,看见这个标志,就一定要用过去完成时.
J-Lo Wants to Be Pregnant by the Time of Her 40th Birthday in July
at that time:是指在过去某段特定的时间,是特指 adv.在那时
Where were you at that time?你当时在哪里呢?