定语从句

prep.+which/prep.+whom中介词的选择:

一先,二谓语,三意义

the occasion when/on which
the place where/at which
situation/case where/in which
point where/at which
activity where/in which

若先行词中有数字,通常后面的定语从句用of which/of whom

it is high/about time that...should+do/did
it/this/that is the first time that...have done...
it/this/that was the first time that...had done...

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