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Other radioactive elements ______ since: actinium (Debierne), radiothorium and mesothorium (Hahn), ionium (Boltwood), etc.

A. were discovered

B. are discovered

C. have been discovered

D. had been discovered

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Identify the underlined word. I cannot go, for I have much to do.

A. adverb

B. conjunction

C. interjection

D. preposition

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