单项选择题

__, he had to leave school.

A．Since his father’s unemployment
B．Since his father was unemployed
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单项选择题
__ astrology and alchemy may be regarded as fundamental aspects of thought is indicated by their apparent universality.
A．Both are
B．What both
C．Both
D．That both
单项选择题
Certain layers of the atmosphere have special names __
A．which indicated their character properties
B．whose characteristic properties are indicating
C．what characterize their indicated properties
D．that indicate their characteristic properties
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