单项选择题

Military orders are ______ and cannot be disobeyed.

A．defective
B．conservative
C．alternative
D．imperative

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单项选择题

______ in a recent science competition, the three students were awarded scholarships totaling $ 21,000.

A．To be judged the best
B．Having judged the best
C．Judged the best
D．Judging the best

单项选择题

______ in the United States, St. Louis has now become the 24th largest city.

A．Being the fourth biggest city
B．It was once the fourth biggest city
C．Once the fourth biggest city
D．The fourth biggest city it was

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