单项选择题

This is not the right ______ to ask for my help; I am far too busy even to listen!

A. moment
B. situation
C. opportunity
D. circumstance
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单项选择题
The priest made the （）of the cross when he entered the church.

A. mark
B. signal
C. sign
D. gesture
单项选择题
The majority of nurses are women, but in the higher ranks of the medical profession women are in a ______.
A. minority
B. scarcity
C. rarity
D. minimum
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