单项选择题

Having finished their morning work, the clerks stood up behind their desks, （）themselves.

A．stretching
B．extending
C．prolonging
D．expanding

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单项选择题
Under the guidance of their teacher, the pupils are building a model boat （）by steam.

A．towed
B．tossed
C．propelled
D．pressed
单项选择题
That part of the city has long been （）for its street violence.

A．historical
B．responsible
C．illegal
D．notorious
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