单项选择题

Investment in new product development is an essential ______ of corporate success.

A．component
B．ingredient
C．constituent
D．element
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单项选择题
By a strange ______ the king was assassinated on the very spot where his grandfather had been killed.
A．coincidence
B．coherence
C．collaboration
D．conception
单项选择题
Doctors say that the disease is most ______ in the first twenty-four hours.
A．ingenious
B．infectious
C．incompatible
D．instantaneous
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