首先说明,这不是定语从句.从句中一定要有主语和谓语,而此句中的动词know后面明显没有主谓,只有一个非谓语动词to visit,所以,这道题的答案应该是A.
(我不知道是否去拜访那个老人)
注意:if一般不能与不定式短语连用
英语定语从句3.I don’t know＿＿＿＿ to visit the old man.A.whether B.if
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