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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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
单项选择题
After()seemed an endless wait, it was her turn to enter the personnel manager's office.

A. that
B. there
C. what
D. it
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