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It is a long time ________ they separated, but it won’t be long ________ they meet again.
| A．since, before | B．after, when | C．since, when | D．after, before |
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It is a long time ________ they separated, but it won’t be long ________ they meet again.
| A．since, before | B．after, when | C．since, when | D．after, before |
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