Friends are angels who lift us to our feet _______________ our wings have trouble remembering how to fly.
A．unlessB．becauseC．thoughD．when
D

試題分析：考查狀語從句。句意：當(dāng)我們遇見麻煩的時候，朋友就是幫助我們的天使。A除非；B因為；C盡管；而本句是指時間狀語。故D正確。
點評：狀語從句的分析要根據(jù)句意的分析來選擇合適的連接詞，同時要注意連詞的一詞多義現(xiàn)象。
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