--Is Tom still in New York or already back at home?
--I’m not sure ________. I’ll call to make sure.
| A．how he will be back | B．that he has come back |
| C．why he has come back | D．if he has been back |
--Is Tom still in New York or already back at home?
--I’m not sure ________. I’ll call to make sure.
| A．how he will be back | B．that he has come back |
| C．why he has come back | D．if he has been back |
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