单选题 Joe assured his boss that he would _____ all his energies in doing his job.无
【正确答案】 C
【答案解析】句意: 乔向他的老板保证, 他将竭尽所能地完成他的工作。 call forth all energies表示“调动所有精力; 竭尽所能”。 call at打电话给。 call on号召; 呼吁。 call off放弃。