题文
With everyone's face ________behind the mask，it's hard to tell who they really are.
| A．hidden |
| B．being hidden |
| C．having hidden |
| D．hiding |
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With everyone's face ________behind the mask，it's hard to tell who they really are.
| A．hidden |
| B．being hidden |
| C．having hidden |
| D．hiding |
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