— Look at the problem! it’s very difficult, I have worked it out.
— Good job.
| A．Although; / | B．Because; so |
| C．Because; / | D．Although; but |
— Look at the problem! it’s very difficult, I have worked it out.
— Good job.
| A．Although; / | B．Because; so |
| C．Because; / | D．Although; but |
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