He says all _______ tried their best and that all that can be done _______ been done.
| A．has, has | B．have, have | C．have, has | D．has, have |
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He says all _______ tried their best and that all that can be done _______ been done.
| A．has, has | B．have, have | C．have, has | D．has, have |
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