单项选择题

The recent airplane crash ______ my belief that stronger safety regulations are needed.

A．infirm
B．affirms
C．firms
D．confirms
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单项选择题
Their marriage is declared ______.
A．ineffective
B．invalid
C．in vain
D．empty
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
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