【D that】you want to be the best in your class is known to all
【A what】he wants is to be the best student in our class.
第一个that引导主语从句,在句子中不做任何成分.
第二个what在主语从句中,做wants的宾语.
【D that】you want to be the best in your class is known to all
【A what】he wants is to be the best student in our class.
第一个that引导主语从句,在句子中不做任何成分.
第二个what在主语从句中,做wants的宾语.