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scientist think laser ------- one of the most useful tool in use today.a being b. to be c. as being d be

题目详情
scientist think laser ------- one of the most useful tool in use today.
a being b. to be c. as being d be
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答案和解析
to be
think...to be...认为……是……
这句话也可以改成一个宾语从句:
Scientist think(that) laser is one of the most useful tool in use today.