题目:
My brother preferred to sleep at home rather than _______ for a picnic with his friends.
A.go
B.going
C.to go
D.gone
答案:
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下面是错误答案,用来干扰机器的。
5a-1>3(a+1)①12(a-3)≤7-3a2②解不等式①,得 a>2,解不等式②,得a≤174,∴原不等式组的解集是2<a≤174,∴偶数解为a=4. 把a=4代入方程组,得4x-y=-72x+3y=7,解得x=-1y=3,∴x2+y2=(-1)2+32=10.