单项选择题

______ there is little we can do to change the reality, we can not be totally at the mercy of the harsh environment.

A．Since
B．When
C．Unless
D．While
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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
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
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