问题
选择题
Making friends is not easy. Sometimes it can take years _______ you become true friends with someone. [ ]
A. before
B. after
C. because
D. unless
答案
答案：A
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Making friends is not easy. Sometimes it can take years _______ you become true friends with someone. [ ]
A. before
B. after
C. because
D. unless
答案：A