【题目】Tom assured (向……保证) his boss that he would _____ all his energies in doing this new job.
A. call forthB. call at
C. call byD. call off
在线课程【答案】A
【解析】
考查动词短语辨析。A. call forth使起作用、唤起；B. call at访问；C. call by顺道拜访；D. call off取消。句意：Tom向老板保证他会全力以赴做好这份新工作。call forth all one’s energies表示“全力以赴”，故A项正确。