题文
A simple 45-minute operation __________ by scientists is hoped to cure blindness in six years.
| A．being developed |
| B．developed |
| C．to develop |
| D．developing |
推荐试卷
A simple 45-minute operation __________ by scientists is hoped to cure blindness in six years.
| A．being developed |
| B．developed |
| C．to develop |
| D．developing |
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