单项选择题

Mary tried _______ to persuade her husband to give up smoking.

A．in line
B．in vain
C．at length
D．without fail
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单项选择题
Parents have a legal _______ to ensure that their children are provided with efficient education suitable to their age.
A．impulse
B．influence
C．obligation
D．sympathy
单项选择题
At last they _______ three figures moving in the distance.
A．turned out
B．made out
C．worked out
D．found out
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