the fourth lesson __we are to learn is much more difficult than the lesson __we learned last week定语从句填空

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the fourth lesson __we are to learn is much  more difficult than the lesson __we learned last week定语从句填空

the fourth lesson __we are to learn is much more difficult than the lesson __we learned last week定语从句填空
the fourth lesson __we are to learn is much more difficult than the lesson __we learned last week
定语从句填空

the fourth lesson __we are to learn is much more difficult than the lesson __we learned last week定语从句填空
that which

The fourth lesson (that) we are to learn is much more difficult than the lesson (that) we learned last week.

that
which

that,/