I don't know why theur friends ( )so happy.括号里填be动词

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Idon''tknowwhytheurfriends()sohappy.括号里填be动词Idon''tknowwhytheurfriends()sohappy.括号里填be动词Idon''tknowwhyt

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.