单项选择题

The tragedy could have been ______ if the crew had followed safety procedures.

A．converted
B．diverted
C．reverted
D．averted
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单项选择题
Professor Wilson has a speaking ______ for this weekend, so-he declined the invitation by his friends for dinner.
A．employment
B．enhancement
C．engagement
D．assignment
单项选择题
She was so ______ in her work that she didn't notice me when I entered the room
A．suffocated
B．dipped
C．immersed
D．submerged
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