单选题：I, who ______ your close friend, will try my best to help yo

题目内容：

I, who ______ your close friend, will try my best to help you out of trouble． A．am
B．is
C．are
D．be

参考答案：【答案仅供学习，请勿对照自行用药等】

答案解析：

We____ the letter yesterday, but it didn't arrive.

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