单项选择题

It can be difficult to ______ the various factors that contribute to a new venture's failure.

A．retain
B．polish
C．isolate
D．deviate
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单项选择题
The prevailing westerly wind should ensure that Montoba Air flight 675 lands at Los Angeles International Airport ______ schedule.
A．down
B．aboard
C．ahead of
D．next to
单项选择题
Before a job interview, it is a good idea to prepare ______ for any questions you might be asked.
A．outwardly
B．hesitantly
C．increasingly
D．thoroughly
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