问题
选择题
—It's been five years _______ we met last time.
—Yes. What a long time! [ ]
A. when
B. until
C. since
D. while
答案
答案：C
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—It's been five years _______ we met last time.
—Yes. What a long time! [ ]
A. when
B. until
C. since
D. while
答案：C