摘要： China isn't rich now, we're working hard to make her richer and stronger(B) A. Though; but B. Though; / C. Both; and D. Because; so so为并列连词.表示结果,because为从属连词.表示原因.但这对因果连词在句中不可同时并用.but也为并列连词.表示转折.与之对应的从属连词though/although 表示让步.它们也不可在句中同时使用.

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