单项选择题

Mary will not be able to come to the birthday party as she is ______ with a cold.

A．laid aside
B．laid by
C．laid up
D．laid down
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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
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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