It’s really unwise of some teenagers from low-income families to spend a large sum of money on Apple products ______ they could buy other cheaper brands.
A．unlessB．whenC．so thatD．in case
B

試題分析： 考查連詞。A 除非B當(dāng)。。時(shí)候C因此D以防萬一 題意 對(duì)于低收入家庭的孩子來說，花很多的錢在蘋果產(chǎn)品上是十分不明智，當(dāng)他們有很多更多便宜的品牌可供選擇的時(shí)候。根據(jù)題意判斷句子所需要的連詞，進(jìn)行判斷，故選B項(xiàng)。
考點(diǎn) 連詞辨析。
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