答案：is worried
Jack 【is】often【worried】about his father's health.
杰克经常担心他父亲的健康.
worry about = be worried about
不明白的再问,多谢!
同义句：Jack often worries about his father's health.
同义句：Jack often worries about his father's health.
Jack ____ often ____ about his father's health.
Jack ____ often ____ about his father's health.
英语人气：823 ℃时间：2019-10-25 07:53:36
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