单项选择题

As an assistant in a shop, she tries to be courteous at all times, even when she is very tired.

A. straightforward
B. polite
C. flexible
D. neat
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He left the building before smoke was spotted coming up the stairs.
A. dropped
B. searched
C. seen
D. led
单项选择题
Two events have highlighted the tensions in recent years.
A. extended
B. emphasized
C. distorted
D. illustrated
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