the children have fun, parents can take dance lessons on the beach.
A．WhenB．IfC．WhileD．Once
C
When既然，當(dāng)……時(shí)；If是否，如果； While然而，當(dāng)……時(shí)。在引到時(shí)間狀語從句時(shí)，強(qiáng)調(diào)主從動(dòng)作同時(shí)發(fā)生；Once一旦。孩子們玩得開心的時(shí)候，父母?jìng)儾拍茉诤┥仙衔璧刚n。結(jié)合語境可知本句強(qiáng)調(diào)主動(dòng)動(dòng)作的同時(shí)進(jìn)行，故選C。
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