单项选择题

Professor Smith is said （）another important discovery in chemistry.

A. to make
B. to have made
C. having being made
D. having made

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Fireworks, （）originated centuries ago in China, were brought to Europe by Marco Polo.

A. which
B. what
C. that
D. it
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Every man, woman, and child （）love and understanding.

A. need
B. are needed
C. is needed
D. needs
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