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| A．where | B．when | C．whose | D．which |
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| A．who | B．where | C．when | D．which |
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| A．That | B．Who |
| C．What | D．When |
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| A．what | B．which | C．that | D．whose |
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| A．because | B．so that | C．in case | D．if only |
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