---Are Mr. and Mrs. Wang living alone in the house?
---Yes, they have three sons, but ______ of them live in their own houses.
| A．neither ???? | B．both | C．all | D．none |
---Are Mr. and Mrs. Wang living alone in the house?
---Yes, they have three sons, but ______ of them live in their own houses.
| A．neither ???? | B．both | C．all | D．none |
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