单项选择题

Professor Lee is said（）another important discovery in physics.

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

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单项选择题
Not once（）his view of life.

A．did Mr. Smith mention
B．Mr. Smith mentioned
C．Mr. Smith mentioned that
D．would Mr. Smith mention
单项选择题
（）in 1292, the bridge is over 700 years old.

A．Built
B．Being built
C．Building
D．To be built
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