题文
They promise that they will finish the project in a month，but I remain _______about their claim.
| A．optimistic |
| B．concerned |
| C．mysterious |
| D．skeptical |
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They promise that they will finish the project in a month，but I remain _______about their claim.
| A．optimistic |
| B．concerned |
| C．mysterious |
| D．skeptical |
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