There is no doubt at all ( )Jane will call us when she gets there.A.if B.whether C.what D.that

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There is no doubt at all ( )Jane will call us when she gets there.
A.if B.whether C.what D.that

D all 后面加定语从句连接词用that

D that
前面有there is no doubt at all,所以不能选whether or if. what第一个排除

不好意思回答迟了,虽然已经选出满意回答了,我只说我的理解
很明显答案是D。 这是一个固定句型,There is no doubt that! at all在这里只是修饰no的。