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      carefullyifanychangeoccurswhendoingexperimentsint...

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問題詳情：

      carefullyifanychangeoccurswhendoingexperimentsint...

       carefully if any change occurs when doing experiments in the lab.

A. Observe                   B. To observe               C. Observed                 D. Observing

【回答】

A

知識點：祈使句 感歎句

題型：選擇題

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