问题描述：
Ten minutes earlier ,____ they cou
Ten minutes earlier ,____ they could have caught the 10 o'clock train.
A .and B .but C.or D.so
,想知道原因.
Ten minutes earlier ,____ they could have caught the 10 o'clock train.
A .and B .but C.or D.so
,想知道原因.
问题解答：
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