单项选择题

If I had not been _____ by the traffic jam, I would have been there by then.

A．interfered
B．postponed
C．delayed
D．prevented
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单项选择题
Learning a foreign language is a question of learning new skills, of ________ new knowledge.
A．obtaining
B．acquiring
C．attaining
D．achieving
单项选择题
School classes were ________ for fear of spreading the disease.
A．paused
B．suspected
C．suspended
D．sustained
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