you understand this rule, you’ll have no further difficulty.
A．UntilB．UnlessC．ThoughD．Once
D

試題分析：考查連詞：A. Until直到，B. Unless除非，C. Though雖然，D. Once一旦，句意是：一旦你理解了規(guī)則，你就不再有困難了。選D。
點(diǎn)評：連詞的考查在于辨別不同的連詞含義，在做題時注意上下文的邏輯關(guān)系。
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