问题
选择题
I’m afraid our personal relationships__________over years may be lost after you move out.
A．building up
B．built up
C．having built up
D．to be built up
答案
答案：B
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I’m afraid our personal relationships__________over years may be lost after you move out.
A．building up
B．built up
C．having built up
D．to be built up
答案：B