单项选择题

Ph. D. students who haven't completed their dissertations by the time their fellowships expire face a dif ficult

A．corner
B．dilemma
C．perplexity
D．bewilderment
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单项选择题
Unless all the members agree to ______ to the plan there may be further development in the course of action.
A．tumble
B．stick
C．come
D．adjust
单项选择题
To the commander's great surprise, the helicopter ______ a light plane and both pilots were killed.
A．coincided with
B．stumbled on
C．tumbled to
D．collided to
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