The doctors in Beijing did all they______ to save Shao Zhanwei, mayor of Hangzhou, but he still died of heart attack at the age of 58.
| A．would | B．could |
| C．must | D．might |
The doctors in Beijing did all they______ to save Shao Zhanwei, mayor of Hangzhou, but he still died of heart attack at the age of 58.
| A．would | B．could |
| C．must | D．might |
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