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