Though working outside, he is always      about his aging mother at home.

A．concerned

B．satisfied

C．excited

D．particular

审核外来原始凭证，发现其金额有错误，应当( )。

A．由原出具凭证的单位重开

B．由原出具凭证单位划线更正并加盖单位公章

C．报经本单位领导批准同意，在原凭证上更正并加盖单位公章

D．按正确的金额更正并告知原出具凭证的单位