I think it’s better to give it a second thought       so many of us consider it a risk．
A．a(chǎn)sB．beforeC．a(chǎn)lthoughD．once
A              
             
試題分析：考查連詞。A．a(chǎn)s 因為；B．before在。。之前；C．a(chǎn)lthough雖然；D．once一旦；句意：因為這么多人認為這是件危險的事，我認為最好三思。兩個句子之間是因果關系，所以選A項。          
考點 : 考查連詞
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