--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 on time as planned.
| A．that | B．when | C．what | D．whether |
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--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 on time as planned.
| A．that | B．when | C．what | D．whether |
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