单项选择题

______most school teachers were men, but today there are more women than men.

A. At once
B. At one time
C. At present
D. At the time
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In many cases, two or three hours are ______ to preview a lesson.
A. informed
B. required
C. demanded
D. inquired
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How long can you hold your ______
A. breathe
B. breath
C. breathing
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