单选题 He ______ a well-meant but unsuccessful campaign to ease East-West tensions calling for arms reduction and a summit of the nuclear powers.
A. embarked on B. reckoned on
C. caught on D. dwelt on

【正确答案】 A

【答案解析】[解析] embark on a campaign“发动了一场运动”；reckon on“依靠；指望”；catch on“理解，明白”；dwell on“详述”。