单项选择题

（） enough time and money, the researchers would have been able to discover more in this field.

A. Giving
B. To give
C. Given
D. Being given

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单项选择题

（） of the burden of ice, the balloon climbed up and drifted to the South.

A. To be free
B. To free
C. Freeing
D. Freed

单项选择题

The children prefer camping in the mountains （） an indoor activity.

A. to
B. than
C. for
D. with

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