—Do you know about the accident which happened in the center of the city?
—Yes. But it was some time we realized the truth.
| A．before | B．when | C．since | D．until |
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—Do you know about the accident which happened in the center of the city?
—Yes. But it was some time we realized the truth.
| A．before | B．when | C．since | D．until |
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