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把……变成________
把……变成
把下列句子合并成含有定语从句的复合句,每空一词,使意思基本不变.
Do you know the boy? We met him in the hospital.
Do you know the boy ________ ________ ________ in the hospital?
It's one of the most important meetings. Many meetings have been held this year.
It's one of the most important meetings ________ ________ ________ held this year.