单项选择题

The directions were so _______ that it was impossible to complete the assignment.

A．ingenious
B．ambitious
C．notorious
D．ambiguous
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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
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
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