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
______ in 1292, the bridge is over 700 years old.
A．Built
B．Being built
C．Building
D．To be built
单项选择题
______ little we may like it, old age comes to us.
A．However
B．So
C．As
D．Despite
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