单项选择题

He （） in the Bank of China for five years by the end of last year.

A.was
B.has been working
C.had been working
D.worked

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It was this book （） I bought the day before yesterday.

A.that
B.which
C.whom
D.who
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Nothing can （） the loss of this letter.

A.make up for
B.make over
C.make out
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