单项选择题

Some selected recruits have been trained at the overseas branches ______ the past three months.

A. over
B. since
C. forward
D. meantime
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Errors or typos, if any, in this textbook should be reported ______ to the publisher.
A. predictably
B. durably
C. promptly
D. spontaneously
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We often receive various requests from customers, but ______ on real estate related contracts.
A. focus
B. focusing
C. focused
D. focuses
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