作业帮I don't know why theur friends ( )so happy.括号里填be动词
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I don't know why theur friends ( )so happy.括号里填be动词
I don't know why theur friends ( )so happy.
括号里填be动词
I don't know why theur friends ( )so happy.括号里填be动词
are
作为从句用正常语序
are
ARE
are
are were 都可以.