The boy’s bad behavior at school his mother many sleepless nights.A. costB. madeC. caused

问题补充：

The boy’s bad behavior at school his mother many sleepless nights.

A. cost

B. made

C. caused

D. led to

答案：

(答案→)A. cost

B. made

C. caused

D. led to

解析：句意：这个男孩在学校的不良表现使得他的妈妈度过了许多不眠之夜。主语是The boy’s bad behavior，可知选A。