单项选择题

Since it is too late to change my mind now, I am______ to carrying out the plan.

A．obliged
B．committed
C．engaged
D．resolved
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单项选择题
Because of the unexpected changes, they postponed ______us an answer.
A．giving
B．have given
C．to give
D．to have given
单项选择题
There are nations whose lack of contact with the outside world has______ poverty.
A．fallen into
B．consisted in
C．resulted in
D．come up to
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