Not knowing what to do, the old lady rang up her son and asked for his help with she

Not knowing what to do, the old lady rang up her son and asked for his help with      she described as a bit of bother.
A. which B. what C. when D. where
【答案】B
【解析】
【详解】考查宾语从句连接词。句意：老太太不知道该怎么办，于是打电话给她儿子，请他帮忙解决她所说的一点小麻烦。with 后接宾语从句，从句中describe缺少宾语，所以用what来充当宾语。故选B项。
【点睛】what常用来引导名词性从句，即主语从句，宾语从句，表语从句和同位语从句。what在引名词性从句时有两个重要的特点：
一是它在相应的名词性从句中一定有含义，常表示“什么”，“所…的”，“…的样子”等.
二是它在相应的名词性从句中一定做成分，而且常做主语，宾语或表语.
分析本句可知，with 后接宾语从句，从句中describe缺少宾语，所以用what来充当宾语。故选B项。