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
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B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。