Every 40 minutes we will take a 20-minute break, ______ your guide will give a short talk on different aspect of the Great Wall.
| A．during that | B．and when | C．which | D．during which time |
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Every 40 minutes we will take a 20-minute break, ______ your guide will give a short talk on different aspect of the Great Wall.
| A．during that | B．and when | C．which | D．during which time |
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