题目内容
In Britain, the best time for sighting is ______ spring and early summer.
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It may be five to ten years ______ we can test this medicine on human patients.
Thirty minutes ______ the limit of this interview.
We were all excited at the news ______ our annual sales had more than doubled.
Until the late 1880s, magazines were only for the rich, who could ______ both the time and money to read them.
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