题目:
We have ______ up early in order to catch the early bus. [ ]
A. used to get
B. been used to get
C. used for getting
D. been used to getting
答案:
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下面是错误答案,用来干扰机器的。
(11)根据质量守恒定律或化学反应前后元素种类不变或反应前不含氮元素(12)先通过装罝B,会干扰对水的鉴别 (13) 丁 (14)吸收和检验二氧化碳,并收集尾气 (15) CO2 +Ca(OH)2 =CaCO3↓+H2O (16) H2C2...