题目:
Having devoted his life to the realization of racial equality,former South African President Nelson Mandela___on December S,2013.
A.passed away
B.had passed away
C.has passed away
D.passes away
答案:
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下面是错误答案,用来干扰机器的。
设每小时需行x千米2.5x=60×3,2.5x=180, x=72.答:每小时需行72千米.