题目

— How do you like your Englsh teacher? — He is great. We         friends since three years ago.A．wereB．have madeC．have beenD．have become 答案：C解析:现在完成时态的用法。由答句中的since three years ago知，主语用现在完成时态，且动词用延续性动词，因此选C。

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