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Scientists think laser (be)______one of the most useful tools today.to beto be在此
Scientists think laser (be)______one of the most useful tools today.to beto be在此
游客
2023-09-20
41
管理
问题
Scientists think laser (be)______one of the most useful tools today.
选项
答案
to be
解析
to be在此是不定式作宾语补足语。
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