单项选择题

There are no ______ differences between the two products, despite the fact that each is made from different materials.

A．observably
B．observing
C．observe
D．observable
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单项选择题
Whoever is in charge of ______ the event must have the ability to work on multiple tasks at the same time.
A．coordinating
B．intending
C．collaborating
D．depending
单项选择题
Even though the conference is not for another eight weeks, we have decided to begin making the necessary ______ now.
A．arranged
B．arrangements
C．arranging
D．arranges
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