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-It's reported that the new underground line has been completed. -Yes, but it ha

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-It's reported that the new underground line has been completed. -Yes, but it ha

-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

试题答案

答案:D