_____we are closely united, we can surely overcome these difficulties.
A．As long asB．As far asC．If onlyD．As good as
A
考查連接詞用法。句意：只要我們緊密團(tuán)結(jié)起來，就能克服這些困難。此處為表示條件的狀語。A項“只要”符合句意；B項“遠(yuǎn)至--”；C項“要是---的話”；D項“和—一樣好，實際上等于”。
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