---When was Tom bitten by a snake?
---It was on a Sunday _______ he was taking a trip to the mountainous area.
| A．that | B．when | C．which | D．where. |
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---When was Tom bitten by a snake?
---It was on a Sunday _______ he was taking a trip to the mountainous area.
| A．that | B．when | C．which | D．where. |
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