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the professor did all he could to help, the experience failed eventually． [ ] A．

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the professor did all he could to help, the experience failed eventually． [ ] A．

________ the professor did all he could to help, the experience failed eventually．

[]A．

Since

B．

When

C．

While

D．

As

试题答案

答案：C

标签：hecouldtoallthe

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