Is this sentence grammatical?
It can be seen that the import and export performance in 1996 was the most outstanding, and that in 1998 was the poorest.

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I think it is grammatical with one exception: you should include an “it” before “was the poorest so that you have a subject (the pronoun “it”, which refers back to “the import and export performance”) to go with the verb “was”.

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Thank you.

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It is in passive voice, it's better to get right to the point. I suggest: In 1996, the import and export performance was outstanding, while the performance in 1998 was the poorest.

Jennifer has it right, but there are many ways to write a sentence like this.

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No. My suggestion is: It is evident that the import and export performance in 1996 was outstanding and that in 1998, it was the poorest.

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