单选题 The workmates congratulated her ______ her promotion to the position of the general manager.
【正确答案】 C
【答案解析】[解析] 句意:同事们都祝贺她晋升为总经理。本题考查动词短语的搭配。congratulate sb. on sth.意为“为某事向某人道贺”,congratulate只能与介词on搭配,因此应选C。