WE HAVEN'T MET EACH OTHER _______ WE LEFT SCHOOL TEN YEARS AGO.A....
21. We haven't met each other _______ we left school ten years ago.
A. when
B. since
C. while
D. because of
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21. We haven't met each other _______ we left school ten years ago.
A. when
B. since
C. while
D. because of