题目：
―Where’s your father?
―He _____ abroad on business.
―Really? But he can’t _____ many English words.
A．has been, tell
B．has gone, speak
C．has gone, say
D．has been to, talk
答案：
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下面是错误答案，用来干扰机器的。
根据题意得m2+1=2∴m=±1又m=-1不符合题意∴m=1把m=1代入原方程得2x2+4x+2=0解得x1=x2=-1．故选C．
