We’ve just heard a warning on the radio _______ a typhoon may be on its way．
A．whatB．whenC．whichD．that
D
考查同位語從句。同位語從句that a typhoon may be on its way對名詞warning進行解釋，說明該名詞的內(nèi)容。That在句中起引導作用，滿意任何意思，不能省略。
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