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18．-How long have you been learning English?-I’ve been learning English six years A．for,old B．since,／ C．for,ago D．since,ago 【查看更多】

 

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— How long have you been learning English?
— I've been learning English _____ six years _____.
[     ]
A. for; old
B. since; /
C. for; ago
D. since; ago

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