The students were studying in____________classroom when, all of ____________sudden,the lights went out.
| A．不填;不填 | B．a;the | C．the;a | D．the；不填 |
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The students were studying in____________classroom when, all of ____________sudden,the lights went out.
| A．不填;不填 | B．a;the | C．the;a | D．the；不填 |
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