单项选择题

Not until a monkey is several years old ______ to exhibit signs of independence from its mother.

A．it begins
B．does it begin
C．and begin
D．beginning
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单项选择题
Old cars are cheaper to buy, but they tend to use more petrol. ______, there is a greater risk of accident.
A．Also
B．However
C．Therefore
D．Hence
单项选择题
Radio is different from television in ______ it sends and receives pictures.
A．which
B．that
C．what
D．this
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