问题

You must observe and gather information like Nicolaus Copernicus ________ you want more career advancement opportunities

A:or
B:because
C:unless
D:if

正确答案是：

同类题型

The lazy waiter _______to his boss that he had _______the table.

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.My reaction towards my classmates at theparty was so cold and emotionless ____ I had never been interested in them.

Jim wants to do __________ today.

I get up early______I can go to school on time.