Although he failed when he tried doing t...

Although he failed when he tried doing the experiment for the first time, he decided to try it____.

A．once in a while

B．at once

C．once more

D．once

C 【解析】本题考查副词短语。句意：虽然他第一次做实验时失败了，可他决定再试一次。once more 再一次, 又一次。

考点分析：

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