. Suddenly everyone stopped talking. It became clear that something unexpected _____. But, for a while, I didn’t know what it was.
| A．has happened | B．is happening | C．happened | D．had happened |
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. Suddenly everyone stopped talking. It became clear that something unexpected _____. But, for a while, I didn’t know what it was.
| A．has happened | B．is happening | C．happened | D．had happened |
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