单项选择题

As an outstanding scholar, he has become ______ to the research team.

A．senior
B．junior
C．indispensable
D．independent
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单项选择题
I must leave now. ______ , if you want that book I'll bring it to you tomorrow,
A．Accidentally
B．Incidentally
C．Occasionally
D．Subsequently
单项选择题
Since the ______ of human history, human beings have been asking questions like What is the essence of life
A．dusk
B．dust
C．twinkle
D．dawn
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