It’s _________ hard problem for the twins that ________ of them can work it out .
| A．so, neither | B．such a, none | C．so a, neither | D．such a, neither |
It’s _________ hard problem for the twins that ________ of them can work it out .
| A．so, neither | B．such a, none | C．so a, neither | D．such a, neither |
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