1：选B 同学,您打错了,应为have it ,根据固定短语have sth.done得应选B：repair的过去分词repaird2:两种说法都不准确：应控制变量举例：10mL 10%的H2O2溶液与等量20%的H2O2溶液中加入等量的MnO2,前者反应速率大于后...
1.—my bike is broken —Why not hao it（
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