【題目】They have (發(fā)現(xiàn)) many kinds of plants in the forest.

【答案】discovered
【解析】句意: 他們已經(jīng)在森林里發(fā)現(xiàn)了許多種植物。根據(jù)助動詞have可知此處是現(xiàn)在完成時, 故用過去分詞discovered。

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