问题
选择题
We’ve just heard a warning on the radio _______ a typhoon may be on its way．
A．what
B．when
C．which
D．that
答案
答案：D
考查同位语从句。同位语从句that a typhoon may be on its way对名词warning进行解释，说明该名词的内容。That在句中起引导作用，满意任何意思，不能省略。