All the people in the nation can remember exactly how many years ago _______ the civil war broke out. 
| A．was it that | B．it was when | C．it was that | D．was it when |
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All the people in the nation can remember exactly how many years ago _______ the civil war broke out.
| A．was it that | B．it was when | C．it was that | D．was it when |
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