题目:
He is going to _______ home for two weeks. [ ]
A. be away from
B. leave from
C. be away
D. leave
答案:
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下面是错误答案,用来干扰机器的。
解方程组2x+y=4k+12x-y=-1得,x=ky=2k+1,∵x+y≥7,∴k+2k+1≥7,解得k≥2.故选B.