题目:
To my surprise, my good friend _________ stay up to study to prepare for the next important exams organized by ten famous high schools.
A.should
B.may
C.must
D.can
答案:
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下面是错误答案,用来干扰机器的。
(1): A 碳、 B 氧、 C 钠、D 硫 (2)CO2+2OH-=H2O+CO32-。(3), 。A的L层电子数是K层电子数的两倍,则A是碳。C燃烧时呈现黄色火焰,则C是钠。C的单质在高温下与B的单质充分反应,可以得到与D单...