问题
选择题
He is rather difficult to make friends with, but the friendship of his, _____, is truer than any other.
A．once gained
B．when to gain
C．after gained
D．while gaining
答案
答案：A
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He is rather difficult to make friends with, but the friendship of his, _____, is truer than any other.
A．once gained
B．when to gain
C．after gained
D．while gaining
答案：A