单项选择题

By the time the war broke out, most of the people had already left.

A．began
B．spoiled the country
C．became less widespread
D．intervened
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单项选择题
Many photographers prefer to take pictures at twilight when they can take advantage of the special effects of the setting sun.
A．at dusk
B．at noon
C．in the spring
D．in the fall
单项选择题
Psychologists have done extensive studies of how well patients comply with doctors’ orders.
A．obey
B．understand
C．improve with
D．agree with
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