单项选择题

He ______ in the Bank of China for five years by the end of last year.
A) was C) had been working
B) has been working D) worked
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单项选择题
He has lived alone ______ he was eighteen. A) about C) at B) since D) by
He has lived alone ______ he was eighteen.
A) about C) at
B) since D) by
单项选择题
It was this book ______ I bought the day before yesterday. A) that C) whom B) which D) who
It was this book ______ I bought the day before yesterday.
A) that C) whom
B) which D) who
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