问题补充：
She is always listening to music doing her homework.
A. as
B. while
C. until
D. though
答案：
A. as
(答案→)B. while
C. until
D. though
解析：A. as尽管，作为 B. while当…时候 C. until 直到… D. though尽管；句意：她总是在做作业的时候听音乐。while表示两个动作同时进行，且多用现在进行时态的形式，两个动作要有延续性，故选B
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