if和whether同时出现在名词性从句中,一般选whether
if 从句只能做动词宾语,其他的 介词宾语,主语,表语等等,统统用whether.
第二题是个主语从句,不能用if 引导.
主语从句：It is not known ____ there was gold in the mine.A.that
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