You must observe and gather information like Nicolaus Copernicus ________ you want more career advancement opportunities.
A．orB．becauseC．unlessD．if
D
這題考查連詞的用法：句意是：你必須觀察收集Nicolaus Copernicus的信息，如果你想要更多的事業(yè)進(jìn)步機(jī)會(huì)。選D。
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