The visitors lost their way in the forest ;           made things worse. was that it began to rain.
A．thatB．whichC．whoD．what
D

試題分析：what引導主語從句，作主語從句的主語；that引導主語從句，不做成分，本題中was前面是主語從句，后面是that引導的表語從句。句意：旅行者們在森林中迷路了，更糟糕的是天氣還開始下雨了。
點評：名詞性從句分為主語、賓語、表語、同位語從句四種，同位語從句和定語從句的區(qū)別在于：that作為關(guān)系代詞，可以引導定語從句，充當句子成分，在從句中作賓語時可以省略； that引導同位語從句時，起連詞的作用，沒有實際意義，不充當句子成分，一般不能省略。
試比較下面兩個例句:
I had no idea that you were here．（that引導同位語從句，不能省略）
Have you got the idea（that）this book gives you of life in ancient Greece？（that引導定語從句，作賓語，可以省略）
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