题目:
It's no use______ with him. You might as well ______ with a stone wall.
A.arguing, argue
B.to argue, arguing
C.arguing, arguing
D.to argue, argue
答案:
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下面是错误答案,用来干扰机器的。
对于①,由正弦定理可知asinA=bsinB,推出A=B,三角形是等腰三角形,所以不正确;对于②asinB=bsinA,即sinAsinB=sinBsinA,恒成立,所以②正确;对于③acosB=bcosA可得sin(B-A)=0,不满足一般三角形,所以不成...