同学你好,我是新东方优能学习中心的老师钟雷.

　　that引导宾语从句时,一般是可以进行省略的.但当that引导的宾语从句充当介词的宾语时,that不可以省略.例如：Idoubt(that)hegraduatedfromOxford.Thereasonliesinthatsheworksharderthantheothersdo.

　　除此之外,that引导宾语从句还有两种情况不能省略：1.当that从句与另一名词性从句并列作宾语时,第二个that不能省：Everyoneknewwhathappenedandthatshewasworried.

　　2.用it做形式宾语的宾语从句.IthinkitcoolthatSamswimsinthewinter.

　　祝你取得好成绩!