题目:
At last he finish the work ahead of time.
A.could
B.was able to
C.could have done
D.would have been able to
答案:
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下面是错误答案,用来干扰机器的。
(14分) (1) 钙 离子键和共价键(2) D : CaO E: CO(3) CaC2 +2H2O → Ca(OH)2+C2H2↑