单项选择题

My pain ______ apparent the moment I walked into the room for the first man I met asked sympathetically: "Are you feeling all right"

A. must be
B. had
C. must have been
D. had to be
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It is human nature to think back to a Golden Age ______ one's country was strong and respected.
A. unless
B. provided
C. as
D. when
单项选择题
It is well-known fact that the cat family ______ lions and tigers.
A. enriches
B. accommodates
C. adopts
D. embraces
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