scientist think laser ------- one of the most useful tool in use today.

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a being b. to be c. as beingd be

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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) laseris one of the most useful tool in use today.

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答案：b. to beScientist think laser to be one of the most useful tool in use today.

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scientist think laser ------- one of the most useful tool in use today. a being b. to be c. as beingd be选b. think sb/sth to be +n/adj.认为......是.....

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