单项选择题

Flag Day is a legal holiday only in the state of Pennsylvania, ______ Betsy Ross sewed the first American flag.

A．which
B．where
C．that
D．has
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单项选择题
______ I realised the consequences, I would never have done that.
A．Unless
B．If
C．When
D．Had
单项选择题
The ______ in David's character has hindered him from advancing in his career.
A．weakness
B．shortcoming
C．demerit
D．defect
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