单项选择题

A naughty boy has ______ the back tyre of my bike.

A．let by
B．let down
C．let in
D．let on
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单项选择题
______ can customers' money be refunded.
A．Under some circumstances
B．Under any circumstances
C．Under no circumstances
D．Under all circumstances
单项选择题
His failure to pay his debts ______ their suspicion that he was not to be trusted.
A．convinced
B．confirmed
C．checked
D．tested
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