题目列表(包括答案和解析)
Mary wrote books to earn money while John gained his wealth ________ selling Mary’s works.
A. with B.
by 
on D.
through
Mary wrote books to earn money while John gained his wealth _________ selling Mary’s works.
A. on B. by C. in D. through
Mary wrote books to earn money while John gained his wealth _________ selling Mary’s works.
A. on B. by C. in D. through
Mary wrote books to earn money while John gained his wealth ________ selling Mary’s works.
A. with B. by 
on D. through
Mary wrote books to earn money while John gained his wealth ________ selling Mary’s works．
A．with B．by C．on D．through
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