单项选择题

Their marriage is declared ______.

A．ineffective
B．invalid
C．in vain
D．empty
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单项选择题
We must ______ the usual customs of the local people and arrange accordingly.
A．assert
B．certain
C．allege
D．ascertain
单项选择题
She is the ______ survivor of the air crash.
A．alone
B．unique
C．single
D．sole
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