1. 陈述句充当宾语从句时,用that引导,that无词义,在口语或非正式文体中常省略。 I hope (that) you will enjoy our performance. She told us (that) the score was 2 to 1. 2. 当由一般疑问句充当宾语从句时,用if或whether引导,意为“是否”。 (1) Is it an interest...