23．—It’s reported that the new underground line has been completed．
—Yes but it hasn’t been made clear________it’s to be opened to traffic．
| A．that | B．who | C．what | D．When |
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23．—It’s reported that the new underground line has been completed．
—Yes but it hasn’t been made clear________it’s to be opened to traffic．
| A．that | B．who | C．what | D．When |
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