—Why couldn’t they meet us at five o’clock?
—Because they were delayed by _________.
| A．heavy traffic | B．heavy traffics | C．crowded traffic | D．crowded traffics |
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—Why couldn’t they meet us at five o’clock?
—Because they were delayed by _________.
| A．heavy traffic | B．heavy traffics | C．crowded traffic | D．crowded traffics |
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