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从括号中所给动词形式中,挑选出正确的
1、I,who_____(is/are/am) your friend,will try my best to help you.
老师为什么选 am?
2.This one of the best novels that _____(have/has) appeared this year.
3.The audience_____(is/are/was/were)so large that no seat was left untaken in the great hall.
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