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20、I believe Shackleton           this unexpected end to his expedition, but he did not waste time on regrets.

A．must have mourned                                    B．must mourn

C．can have mourned                                      D．could mourn

20、A

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I believe Shackleton           this unexpected end to his expedition, but he did not waste time on regrets.

A．must have mourned                                    B．must mourn

C．can have mourned                                      D．could mourn

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