问题补充:
He used to be afraid of the dark so he used to go to sleep the light .
A. with , in
B. with , on
C. by , on
D. by , in
答案:
A. with , in
(答案→)B. with , on
C. by , on
D. by , in
解析:with带有,伴随;in在里面;on在上面;by通过某种方式;句意:他过去害怕黑暗,因此他常常开着灯睡觉.结合语境可知前一空用with表示伴随状态,下文on可用作形容词,开着的.故选B.