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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．

A．that                     B．who                    C．what                     D．when

—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

—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

—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

—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

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

—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

—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

—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

—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