单项选择题

It's ten years since the scientist ______on his life's work of discovering the valuable chemical element.

A．made for
B．set out
C．took off
D．turned up
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单项选择题
After several rounds of talks Florence was able to______ a deal with the nursery home.
A．hit
B．pound
C．punch
D．strike
单项选择题
Professor McDonald's______ knowledge on this subject resulted in his authority in this academic field.
A．extensive
B．excessive
C．expensive
D．intensive
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