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The scientists are urging that the chemical _____．
A．is bannedB．should banC．be bannedD．must be banned
C

試題分析：考查虛擬語氣。動詞urge后面的賓語從句使用虛擬語氣(should)+動詞原形。本題省略了should，故C正確。
點評：動詞urge后面的賓語從句使用虛擬語氣(should)+動詞原形。
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