题文
In buses, all of us _________ thieves.
| A．keep an eye out for | B．are keep an eye out for |
| C．are kept an out for | D．keep eye out for |
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In buses, all of us _________ thieves.
| A．keep an eye out for | B．are keep an eye out for |
| C．are kept an out for | D．keep eye out for |
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