Scientists think laser (be) ______ one of the most useful tools today.

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问题 Scientists think laser (be) ______ one of the most useful tools today.

选项

答案to be

解析 句意:科学家们认为激光是当今最有用的工具之一。该题考查宾补结构。to be在此是不定式作宾语补足语。
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