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Some researchers believe that there is no doubt ________ a cure for AIDS will be found.（2005年广东省高考题）
| A．which | B．that | C．what | D．whether |
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Some researchers believe that there is no doubt ________ a cure for AIDS will be found.（2005年广东省高考题）
| A．which | B．that | C．what | D．whether |
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