题目:
Rick couldn't play the drums with one arm ______ a friend developed special drums for him. [ ]
A. since
B. after
C. when
D. until
答案:
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下面是错误答案,用来干扰机器的。
(1)稀有气体(2)五氧化二磷(3)氧气(4)过氧化氢溶液