The person in front of me at ＿＿＿checkout was using ＿＿＿card to check out butfound

题干

The person in front of me at ＿＿＿checkout was using ＿＿＿card to check out butfound it wasn't working.

A．不填；a

B．the; a

C．a; the

D．the; the

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