15. Mr. Watson has been doing ______ with the cigar importer for over a decade.
(A) treat
(B) wage
(C) business
(D) vocation
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統計: A(33), B(11), C(353), D(23), E(0) #2030888
統計: A(33), B(11), C(353), D(23), E(0) #2030888