—What’s wrong with you?
—I wasn’t careful enough and _______an old man while walking along the street.
| A．knocked off | B．knocked up |
| C．knocked into | D．knocked out |
—What’s wrong with you?
—I wasn’t careful enough and _______an old man while walking along the street.
| A．knocked off | B．knocked up |
| C．knocked into | D．knocked out |
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