单项选择题

As the mountains were covered with a ______ of cloud, we couldn't see their tops.

A．coating
B．film
C．veil
D．shade
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单项选择题
The mayor threatened to use his ______ over the city council's proposal.
A．vote
B．vase
C．veto
D．vent
单项选择题
The neighborhood boys like to play basketball on that ______ lot.
A．valid
B．vain
C．vacant
D．vague
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