问题
选择题
___________ Tracy became seriously ill, she still went on working. [ ]
A. If
B. Unless
C. And
D. Even though
答案
答案：D
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___________ Tracy became seriously ill, she still went on working. [ ]
A. If
B. Unless
C. And
D. Even though
答案：D
平面上的牙是（）。