The police still haven’t found the lost child, but they’re doing all they .（2011四川卷）
| A．can |
| B．may |
| C．must |
| D．should |
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The police still haven’t found the lost child, but they’re doing all they .（2011四川卷）
| A．can |
| B．may |
| C．must |
| D．should |
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