问题补充：
Don’t worry about the child. Next to him a lady, he can turn when he is in trouble.
A. sits; whom
B. sits; to whom
C. is sitting; with whom
D. was sitting; to whom
答案：
A. sits; whom
(答案→)B. sits; to whom
C. is sitting; with whom
D. was sitting; to whom
解析：考查倒装和定语从句。Next to him，介词短语放在句首时，句子要完全倒装，根据句子中的Don’t，can和is可知不用过去时态，排除D；a lady是先行词，代入定从 he can turn when he is in trouble.应是he can turn to the lady when he is in trouble。turn to sb.向某人寻求帮助，所以选B。
