You should not go rafting ________ you know how to swim.
A．ifB．if notC．whenD．unless
D

試題分析：考查連詞辨析。A如果；B如果不；（其中的not要與…分開）；C當(dāng)…時(shí)；D除非；如果…不…；句意：如果你知道如何游泳，你本不應(yīng)該去漂流。故D正確。
點(diǎn)評：連詞的詞義辨析要放在上下文的語境中進(jìn)行，要注意上下文的語義的串聯(lián)以及邏輯關(guān)系的推理，特別要注意一些連詞和時(shí)間狀語的固定搭配。
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