For theme parks, ______ is the key to _____ visitors, which contributes to the success of running them.
| A．the variety; attracting | B．A variety; attract |
| C．Variety; attracting; | D．Variety; to attract |
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For theme parks, ______ is the key to _____ visitors, which contributes to the success of running them.
| A．the variety; attracting | B．A variety; attract |
| C．Variety; attracting; | D．Variety; to attract |
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