[字辨] 大家贊成這樣的說法嗎 can/be able to

[nikecezanne (無線上交談技能)]

Weak: We were able to get their full agreement.
Better: We could get their full agreement.

一次寫作
我的英文老師把我的can一律變成be able to
但是在寫作書又看到上述示例
請問大家覺得如何
謝謝

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