study的过去式和过去分词怎么写

  Coincidentally, they had both studied in Paris. 碰巧的是,他们俩都在巴黎学习过。 He studied conscientiously and enthusiastically. 他认真积极地学习。 Many toxic effects can be studied at the cellular level.

  Coincidentally, they had both studied in Paris.

碰巧的是,他们俩都在巴黎学习过。

He studied conscientiously and enthusiastically.

他认真积极地学习。

Many toxic effects can be studied at the cellular level.

许多毒性作用在细胞阶段就可加以研究。

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