Mr．Smith gave the attendants a wonder lecture the pany in the international conference.
A. on behalf'of
B. owing to
C. in the place of
D. standing for
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(答案→)A. on behalf'of
B. owing to
C. in the place of
D. standing for
解析：考查介词短语：A．on behalf'of代表，B．owing to由于，因为， C．in the place of代替， D．standing for代表，句意：斯密斯先生代表公司在国际会议上给与会的人做了精彩的演讲。选A。