The doctors in Shenzhen did all they ______ to save Yao Beina, a famous singer, but she still died.
| A．would | B．could | C．must | D．Might |
The doctors in Shenzhen did all they ______ to save Yao Beina, a famous singer, but she still died.
| A．would | B．could | C．must | D．Might |
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