问题
It was his studying in No.2 High School of Baoding for three years ____ laid the foundation of his successful career.[ ]
A: that
B: when
C: since
D: until
B: when
C: since
D: until
正确答案是：
同类题型
wn, Emma . You will only makeyourself more tired, on yourfeet.
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I didn’t know the new word in the text, so I had to the word in a dictionary.