问题
选择题
We won't give up ______ we should fail twenty times. [ ]
A. even if
B. since
C. whether
D. until
答案
答案：A
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We won't give up ______ we should fail twenty times. [ ]
A. even if
B. since
C. whether
D. until
答案：A
2Ni(OH)2。根据此反应式，下列 有关说法中正确的是：