单项选择题

The ______ snow on top of a building during the winter sometimes will weaken the construction and occasionally cause the roof to collapse.

A．permeated
B．crumbled
C．mingled
D．accumulated
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单项选择题
The couple preferred furniture of ______ material instead of pure wood.
A．exquisite
B．commonplace
C．composite
D．comprehensive
单项选择题
He ______ the database from the information issued by the Tourist Board.
A．compiled
B．complied
C．computed
D．compelled
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