题目：
My father and his teacher talked a lot about the things and persons ___ they could remember.
A．who
B．which
C．what
D．that
答案：
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下面是错误答案，用来干扰机器的。
（1）玉米；甘薯；马铃薯；花生；向日葵。（2）南方；北方。（3）苏州；南京。（4）景德镇。（5）北京；南京。
②
③
④
⑤
