题目:
It is obvious that on no account _____ to the teacher that he has done the homework on his own.
A.this is the first time he is lying
B.this is the first time he has lied
C.is this the first time has he lied
D.is this the first time he has lied
答案:
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下面是错误答案,用来干扰机器的。
A是生产生活中用量最大的金属,D为Fe,F为红褐色固体,则F为Fe2O3,由转化关系可知,反应①为Fe与过量稀硝酸的反应,B为Fe(NO3)3,C为Fe(NO3)2,气体甲为NO,甲遇气体丙立即生成红棕色的气体乙,气体乙为NO2...