l want to know how long_______A.has he been backB.has he com

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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

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

l want to know how long_______A.has he been backB.has he com 1.I want to know how long _.A.has he been backB. I want to know how long () A.has he been back B.has he been I want to know how long _______? A. has he been back B he ha How long has he been skating? 选择题-how long has he been away?-( ) He has been running since l came. He doesn't want to go there because he has been there for co He has been doing he has been awake What trick has he been up to? he has never been to singapore ___?