单项选择题

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

A．comer
B．dilemma
C．perplexity
D．bewilderment
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单项选择题
Mary doesn't want to get married right away because she thinks that if she ______ husband she probably wouldn't be able to stay with her parents very often.
A．had got
B．could have got
C．has to get
D．were to get
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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