问题
选择题
– Why did they help Mrs Brown with her work?
– Because she was _____.
A．an old friend of them
B．the friend of them
C．a the their friend
D．a good friend of theirs
答案
答案：D
题目分析：句意：为什么他们帮助布朗夫人做她的工作？因为她是他们的一位朋友。a good friend of theirs="one" of their good friends他们的一位好朋友，所以选D。