自我完善的四部曲是指认识自我、悦纳自我、延伸自我、创造自我。()

That student blamed his failure of the exam _______his teacher.

A.on
B.for
C.of
D.to

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It has been _______a year since we last heard from him.

A.for
B.before
C.within
D.over

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