问题
选择题
In the dark street, there wasn’t a single person she could turn for help.
A．who
B．whom
C．that
D．to whom
答案
答案：D
本题考查定语从句。根据句意表示“向某人求助”是turn to sb. for help，其中介词to可提前，故答案为D。本句也可以如下表达：In the dark street, there wasn’t a single person (who/whom/that) she could turn to for help.)
中，m、n、p、q表示某元素的四个角码。若x1与x2的q均为1，m、p对应相等，n不相等，则x1、x2表示的可能是( )