问题描述：
Our plan is to keep the affair secret.这个句子是主系表结构吗?
如果是主系表结构,is是系动词,to keep the affair secret是表语还是keep the affair secret是表语?
如果是主系表结构,is是系动词,to keep the affair secret是表语还是keep the affair secret是表语?
问题解答：
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