作业帮l want to know how long_______A.has he been backB.has he come backC.he has been backD.he has come b为什么
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l want to know how long_______A.has he been backB.has he come backC.he has been backD.he has come b为什么
l want to know how long_______A.has he been backB.has he come backC.he has been backD.he has come b
为什么
l want to know how long_______A.has he been backB.has he come backC.he has been backD.he has come b为什么
选C,因为后面的句子要用陈述语态.back是一个瞬时动词,完成时里面要用has been back
B
A.has he been back
how long多久了，要用延续性动词be
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