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答案是:
✘ It's so convenience.
✓ It's so convenient.

「convenient」和「convenience」中文來說也是方便,但 convenient 是形容詞,convenience 是名詞,句子這裡是要用形容詞的,所以答案應該是「convenient」,例如:
It's so convenient that you live near the office.

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