______ they are twin brothers， ______ they don't look like each other．（ ）
| A． |
Although； / |
| B． |
Although； but |
| C． |
But； although |
______ they are twin brothers， ______ they don't look like each other．（ ）
| A． |
Although； / |
| B． |
Although； but |
| C． |
But； although |
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