Some people waste a lot of food___________ others don’t have enough to eat.
A．howeverB．whenC．a(chǎn)sD．while
D

試題分析：原句意思是：一些人浪費(fèi)許多的糧食，而另外一些人卻沒有足夠的東西吃.however“然而”，“但是”,when“當(dāng)……時(shí)”, as“當(dāng)……時(shí)候”，“一邊……一邊……”, while“而”，“與此同時(shí)”，本句里沒有主從關(guān)系，所以不選B和C，however的轉(zhuǎn)折語(yǔ)氣強(qiáng)，此句是并列地說(shuō)兩件事，根據(jù)句意,可知選D.
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