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宾语从句中的连接词that在以下三种情况下不能省略：
（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；
（2）当that作介词宾语时，that不可省掉。
（3）用it做形式宾语的宾语从句
Everyone knew what happened and that she was worried.
The reason lies in that she works harder than the others do.
（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；
（2）当that作介词宾语时，that不可省掉。
（3）用it做形式宾语的宾语从句
Everyone knew what happened and that she was worried.
The reason lies in that she works harder than the others do.
