单项选择题

Changes in climate （）slowly through the years.

A．make progress
B．take place
C．keep pace
D．set sail

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单项选择题
Radios today seldom need （）or the attention of a technician.

A．to repair
B．repaired
C．repairing
D．to have repaired
单项选择题
You should use （）and natural language when you write a personal letter.

A．formal
B．political
C．magic
D．plain
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