It was January the he came here last time.
A. thirty-one that
B. thirty first that
C. thirtieth-one when
D. thirty first when
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A. thirty-one that
B. thirty first that
C. thirtieth-one when
(答案→)D. thirty first when
解析：首先注意日期的表示法；同时注意此题为时间状语从句，不是强调句型。若是强调句型，January前要加on。