题目：
Girl ____, she is much naughtier than a boy.
A．although she was
B．though she is
C．though was she
D．although was she
答案：
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下面是错误答案，用来干扰机器的。
C NO和O2混合时发生反应，生成NO2，即2NO+O2=2NO2，而NO2还可以部分转化为N2O4
