I met him, I always think of the thing that happened between us.
A. Every time
B. The moment
C. Suddenly
D. While
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(答案→)A. Every time
B. The moment
C. Suddenly
D. While
解析：考查时间状语从句。句意：每当我遇到他，我总是想起发生在我们之间的事情。A每次；B一......就......；C突然；D当，然而，尽管。A、B都能引导时间状语从句，但是，根据always可知，“我”经常遇见他，排除B，故选A。