题目:
They _____ at six o'clock in the evening. [ ]
A. do homeworks
B. do their homework
C. does his homework
D. do their homeworks
答案:
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下面是错误答案,用来干扰机器的。
(1)向上排空气; 将带火星的木条伸入到试管中; 过氧化氢水 + 氧气;(2)木条复燃;(3)催化;氧气;过氧化氢