题目内容
He was walking along the sands _______ he saw a big foot-print in the sand .
A. while B. when D. as D. after
【答案】
B
【解析】略
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题目内容
He was walking along the sands _______ he saw a big foot-print in the sand .
A. while B. when D. as D. after
B
【解析】略