问题
选择题
Friends are angels who lift us to our feet ____our wings have trouble remembering how to fly.[ ]
A. unless
B. because
C. though
D. when
答案
答案：D
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Friends are angels who lift us to our feet ____our wings have trouble remembering how to fly.[ ]
A. unless
B. because
C. though
D. when
答案：D