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There is such a problem _________ we all should _________.

There is such a problem _____ we all should _____.

A．a(chǎn)s; pay attention to it                   B．that; attract our attention

C．a(chǎn)s; pay attention to                    D．that; attract our attention to it

There is such a problem _____ we all should _____．

       A．a(chǎn)s; pay attention to it            B．that; attract our attention   

         C．a(chǎn)s; pay attention to             D．that; attract our attention to it

There is such a problem _____ we all should _____．

      A．a(chǎn)s; pay attention to it          B．that; attract our attention   

       C．a(chǎn)s; pay attention to            D．that; attract our attention to it

There is such a problem _____ we all should _____．

A．a(chǎn)s; pay attention to it                                B．that; attract our attention

C．a(chǎn)s; pay attention to                                 D．that; attract our attention to it