Among the 15-year-old children, some studying in university while others are still learning to read and write.
| A．should have been | B．would have been | C．can be | D．must be |
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Among the 15-year-old children, some studying in university while others are still learning to read and write.
| A．should have been | B．would have been | C．can be | D．must be |
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