单项选择题

（） for their help, we should be in big trouble.

A.Were not it
B.It were not
C.Were it not
D.It was not

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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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