一定要有is
因为sam是主语,friendly是表语,中间要用is（系动词）连接
请点击下面的“选为满意答案”按钮,
Sam is always friendly to his parents.一定要有 is
Sam is always friendly to his parents.一定要有 is
英语人气：314 ℃时间：2019-11-02 20:26:50
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