(2013·江蘇，28)In the global economy，a new drug for cancer，________it is discovered，will create many economic possibilities around the world.
A．whatever　B．whoeverC．whereverD．whichever
C
考查狀語從句。此處考查－ever引導的讓步狀語從句。通過分析從句，可知句子不缺少主干成分，故排除代詞A、B、D三項，故答案選C。
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