In their teens．,In their twenties．,At an old age．,In th-找考题网

单项选择题

A．In their teens.
B．In their twenties.
C．At an old age.
D．In their thirties.

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单项选择题A．In America cars have been equipped with safety belts since 1964.B．In America cars were equipped with safety belts until 1964.C．After 1964, some organizations began to advocate the use of safety belts.D．Some organizations began to advocate the use of safety belts in 1964.

A．In America cars have been equipped with safety belts since 1964.
B．In America cars were equipped with safety belts until 1964.
C．After 1964, some organizations began to advocate the use of safety belts.
D．Some organizations began to advocate the use of safety belts in 1964.

单项选择题A．$16.B．$8.C．$32.D．$40.

A．$16.
B．$8.
C．$32.
D．$40.

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