Where is our math teacher? -He___to Shanghai A.has gone B.has been C.is going

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Where is our math teacher? -He___to Shanghai A.has gone B.has been C.is going
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Where is our math teacher? -He___to Shanghai A.has gone B.has been C.is going
Where is our math teacher? -He___to Shanghai A.has gone B.has been C.is going

Where is our math teacher? -He___to Shanghai A.has gone B.has been C.is going
A.has gone
B been代表了曾经去过
Cgoing 代表将来要去
只有A符合,去了但是没回来