单项选择题

In the book, the author reminded the world that（）something were done, many of the great animals of the African plain and jungle would soon become extinct.

A. if
C. unless
B. because
D. in case

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单项选择题

You mustn’t be too proud of yourself（）you have made much progress.

A. even if
C. because
B. as
D. since

单项选择题

How does the man probably feel（）

A. Happy
C. Disappointed
B. Resentful
D. Sentimental

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