Question

19. The reason why I was sad was               . (understand)

我很伤心的原因是他不理解我。

Answer 1

19. that he didn't understand me考查表语从句。表语从句位于主句中的连系动词之后。引导表语从句的词有从属连词that,whether,asthough(if); 连接代词who,what,which, whom,whose, what?ever,whoever, whomever, whichever等;连接词when,where, why,how,however, whenever, wherever等。可以接表语从句的连系动词有be, look,remain,seem等。本句从句中什么成分也不缺，所以由that引导。表语从句中的that不能省。