Sent to the zoos in Beijing and other cities the monkeys are reported .A. to settle downB

问题补充：

Sent to the zoos in Beijing and other cities, the monkeys are reported .

A. to settle down

B. to settle in

C. to have settled in

D. to have settled down

答案：

A. to settle down

B. to settle in

C. to have settled in

(答案→)D. to have settled down

解析：词义辨析及考察非谓语动词. settle down定居,安定下来; settle in迁入.句意:被送到北京和其他城市后,据报道这些猴子已经安定下来.不定式表示具体的将要进行的动作,如果动作发生在谓语动词之前,则要用完成时态的不定式.结合语境可知选D.