Madame Curie is believed _______ radium.
A．discoveringB．having discoveredC．to have discoveredD．to discover
C
句型sb be believed to do 據(jù)說… 。 根據(jù)語境可知discover是已發(fā)生的動作所以用不定式的完成式。 據(jù)說居里夫人發(fā)現(xiàn)了鐳。 選C
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