all of them look very happy.为什么不用they.

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• we are all very excited and are looking forward to the Olympic Games.这句话是新概念第二册37课最后一句话!请教这句话是不是并列句?如果是and前和and后的时态为什么不一致?具体讲解一下.后面为什么不用look?而用looking.
• all of them look very happy.为什么不用they.
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• all of them look very happy.为什么不用they.
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