I didn't hear the phone,I___out,A .must be B,must have gone C.must go

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I didn't hear the phone,I___out,A .must be B,must have gone C.must go

I didn't hear the phone,I___out,A .must be B,must have gone C.must go
I didn't hear the phone,I___out,A .must be B,must have gone C.must go

I didn't hear the phone,I___out,A .must be B,must have gone C.must go
B 意思是 我没听见电话想 我一定是出去了,有过去完成时的意思

B,must have done表对过去肯定推测

B