We all need knowledge from the past — ______ it comes from personal experience or from studying history. It is our only guide to the future.
| A．as | B．whether | C．how | D．when |
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We all need knowledge from the past — ______ it comes from personal experience or from studying history. It is our only guide to the future.
| A．as | B．whether | C．how | D．when |
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