- It’s _____ hard problem for the twins that ____ of them can work it out.
| A．so; neither | B．such a; neither |
| C．so a; neither | D．such a; none |
- It’s _____ hard problem for the twins that ____ of them can work it out.
| A．so; neither | B．such a; neither |
| C．so a; neither | D．such a; none |
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