We decided to test the theory experimentally.

我们决定对这个理论进行实验检验。

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When we are going to have an English test has not been decided yet.

我们什么时候进行英语测验还没有决定。

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So we decided to conduct a little test.

因此，我们决定进行一次小测验。

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So we decided to conduct a little test.

因此，我们决定进行一次小测验。

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