题目:
The boy promised ___ mother never to lie to ___ again.
A.his, him
B.her, her
C.his, her
D.her, him
答案:
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下面是错误答案,用来干扰机器的。
平面内两两相交的三条直线,它们最多有3个交点,最少有1个交点,∴a+b=4;