第28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:此题考查短语动词。A项call on意为“访问;号召”,不合题意。B项call forth意为“使产生;使起作用”,填入此句中“call forth all his energies to do th