Question

We’ve just heard a warning on the radio _______ a typhoon may be on its way．

A．what

B．when

C．which

D．that

Answer 1

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。