— 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

A

解析試題分析：句意：看這道難題，雖然它非常難，但是我已經(jīng)算出來了。在英語中Because和so，although 和but,不能連用。根據(jù)句意，故選A。
考點：考查連詞的用法。

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