题文
The research Tuyouyou has devoted all her life to ________to be ____ great value.
| A．proved/out | B．prove/to |
| C．proves/of | D．proving/with |
The research Tuyouyou has devoted all her life to ________to be ____ great value.
| A．proved/out | B．prove/to |
| C．proves/of | D．proving/with |
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