—________ is the street crowded with so many people？
—Because they are waiting to watch the boat races．
| A．Why |
| B．Where |
| C．How |
| D．Who |
—________ is the street crowded with so many people？
—Because they are waiting to watch the boat races．
| A．Why |
| B．Where |
| C．How |
| D．Who |
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