---Bad luck! I ________ the sidewalk when an Audi cut in and knocked me down.
---You can never be too careful!
| A．crossed | B．have crossed |
| C．was crossing | D．had been crossing |
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---Bad luck! I ________ the sidewalk when an Audi cut in and knocked me down.
---You can never be too careful!
| A．crossed | B．have crossed |
| C．was crossing | D．had been crossing |
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