Question

I often doubt           .

A．that this song is worth listening to	B．if this song is worth listening
C．that this song is worth listening	D．if this song is worth listening to

Answer 1

B

本題的含義是我經常懷疑這首歌是否值得去聽，if引導一般疑問句的賓語從句，表示是否的意思，be worth doing sth表示值得做某事，后面沒有名詞或代詞，listen無需加to，故本題選B。