she is not so healthy           she used to be?

A．How it is that; as

B．Why is it that; as

C．Is it why; that

D．How is it that; what

无效的劳动合同，从订立的时候起就没有法律约束力。以下属于无效劳动合同的有（）。

A.劳动报酬较低的合同

B.违反法律法规的合同

C.采用欺诈、威胁等手段订立的违背对方真实意思签订的合同

D.未规定明确合同期限的合同

E.用人单位免除自己法定责任、排除劳动者权利的合同