单项选择题

After four years in the same job, his enthusiasm finally ______.

A．deteriorated
B．dispersed
C．dispatched
D．drained

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单项选择题

They were extremely impressed by him because he was ______ generous.

A．excessively
B．exceedingly
C．excessly
D．exceeding

单项选择题

The Bunsen burner is so named because it is thought ______ by Robert Bunsen, who was German by birth.

A．having been invented
B．to be invented
C．to have been invented
D．being invented

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