单项选择题

America will never again have as a nation the spirit of adventure as it （）before the West was settled.

A. could
B. did
C. would
D. was

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单项选择题
（）depends on the density of both the object and the water.

A. An object floats whether or not
B. Whether or not an object floats
C. Floating an object whether or not
D. Whether or not a floating object
单项选择题
It wasn’t such a good dinner （）she had promised us.

A. that
B. as
C. which
D. what
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