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
Geoffrey Chaucer occupies a ______ place in English literature.
A. most unique
B. least unique
C. very unique
D. unique
单项选择题
Very few people could understand the lecture the professor delivered because its subject was very ______
A. intriguing
B. indefinite
C. obscure
D. dubious
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