第17题: [单项选择]The young man assured the boss that he would ______ all his energies to do the job well. A. call on B. call forth C. call at D. call off 参考答案:B 答案解析:[精解] 题型:词汇题。此题考查短语动词。call on访问;号召。call forth使产生;使起作用,填入此句中“call forth all his energies to do the job