﹣﹣﹣Why were you late for school this morning，Tom？
﹣﹣﹣I was about to go to school _________ it began to rain．（ ）
A．sinceB．whileC．asD．when
﹣﹣﹣Why were you late for school this morning，Tom？
﹣﹣﹣I was about to go to school _________ it began to rain．（ ）
A．sinceB．whileC．asD．when
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