题文
New books have been given out to the students, _______is happy with the books.
| A．each of them |
| B．each of whom |
| C．that |
| D．whom |
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New books have been given out to the students, _______is happy with the books.
| A．each of them |
| B．each of whom |
| C．that |
| D．whom |
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