Some people waste a lot of food ____ others haven't enough to eat.
A．onceB．whenC．a(chǎn)sD．while
D

試題分析：考查連詞：A. once一旦B. when當(dāng)…時(shí)候，C. as當(dāng)…時(shí)候，正如，因?yàn)�，D. while當(dāng)…時(shí)候，雖然，然而，句意：一些人浪費(fèi)糧食而有些人吃不飽。選D。
點(diǎn)評(píng)：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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