The question______new measures should be taken to control the terrible air pollution is______puzzles scientists a lot.
A．that; whatB．which; thatC．what; whatD．which; that
C

試題分析：考查同位語從句和表語從句。句意：應該采取什么樣的新措施來控制空氣污染的問題，是讓科學家非常困惑的事情。根據(jù)句意可知，既然是question，就說明措施并不明確，應該是“什么樣的new measures”，that引導同位語從句時，沒有詞義，不選A；is后的表語從句缺少主語，排除B、D；故選C。
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