单项选择题

A wolf escaped from the zoo last night. It was a long time（）the guards discovered what had happened.

A. before
C. since
B. until
D. when

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单项选择题
How will the woman go to Central Square（）

A. She will go on foot.
C. She will go by bus.
B. She will take two turnings.
D. Not mentioned.
单项选择题
（）men have learned much from the behavior of animals is brand-new.

A. That
C. What
B. Those
D. Whether
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