单项选择题

Thick clouds obscured the stars from view.

A．darkened
B．held
C．blackened
D．prevent
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单项选择题
It is said the houses aidng this street will soon be demolishe
A．pulled down
B．pulled up
C．pulled off
D．pulled in
单项选择题
Data from Voyager II have presented astronomers with a puzzle about why our outermost planet exists.
A．problem
B．mystery
C．question
D．point
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