______ we deal with our problems, we can easily become unhappy.
A．UnlessB．UntilC．ThoughD．Whether
A
考查連詞的用法。句意“我們除非處理好我們的問(wèn)題，不然我們會(huì)很容易變得不開(kāi)心�！眜nless“除非”；until“直到”；though“雖然，盡管”；whether“是否”。故選A。
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