问题补充：
On hearing the news, the president his visit to Australia and returned home immediately.
A. broke off
B. went off
C. kept off
D. took off
答案：
(答案→)A. broke off
B. went off
C. kept off
D. took off
解析：短语辨析。A折断，中断；B离开，消失；C不接近，避开；D脱掉，起飞，成功；结合句意可知A正确。句意：一听见这个消息，总统中断了去澳大利亚的访问，立刻回国。
