Actually, I have been thinking about online shopping for a long time.() A. 事实上，很久以前我就已经考虑过网上购物了。B. 事实上，我一直考虑网上购物已有很长时间了。C. 事实上，我正在考虑长时间网上购物。

Actually, I have been thinking about online shopping for a long time.()

A. 事实上，很久以前我就已经考虑过网上购物了。

B. 事实上，我一直考虑网上购物已有很长时间了。

C. 事实上，我正在考虑长时间网上购物。

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