主语从句：It is not known ____ there was gold in the mine.A.that

主语从句：It is not known ____ there was gold in the mine.A.that B.whether C.if D.when
主语从句：It doesn't matter ____ she will leave.A.that B.when C.if D.what
为什么第一题是选B.wheter 而不可以选C.if呢?
为什么第二题是选B.when 而不可以选C.if呢?

ieiiiii 1年前已收到1个回答举报

qinguo_0625 幼苗

共回答了14个问题采纳率：85.7% 举报

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.

1年前

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