单项选择题

The reason for their unusual behavior remains a puzzle.

A. fact
B. mystery
C. statement

D. game
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She will be pleased to meet you.
A. angry
B. happy
C. sad
D. unwilling
单项选择题
I rarely wear a raincoat because I spend most of my time in a car
A. normally
B. seldom
C. frequently
D. usually
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