单项选择题

A group of angry parents had __________ outside the head teacher's office.

A．assembled
B．accumulated
C．piled
D．joined
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单项选择题
However many of the considerations which apply to small utility boilers are directly applica ble __________ large industrial boilers.
A．for
B．on
C．to
D．into
单项选择题
Yet even here the actual extent to which the rural __________ was altered is considerably less than we might suppose.
A．scenery
B．landscape
C．prosperity
D．perspective
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