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
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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
单项选择题
I didn't make out what the professor means because his handwriting is so ______.
A．eligible
B．illegible
C．knowledgeable
D．vague
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