单项选择题

A. In a laboratory.
B. In a library.
C. In a hotel.
D. In a coffee shop.
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单项选择题
This morning when I was walking to my office, I ______ to see an old friend of mine near the office building.
A. occurred
B. happened
C. managed
D. settled
单项选择题
______ the population is too large, the government has to take measures to control the birth rate.
A. Although B. Since
C. If D. Until
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