I had just taken a bite of my hot dog ________ I heard a familiar voice yelling at me from across the crowded school yard.
| A．before | B．while | C．since | D．when |
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I had just taken a bite of my hot dog ________ I heard a familiar voice yelling at me from across the crowded school yard.
| A．before | B．while | C．since | D．when |
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