If anyone happens to call while I am out of the office, please h

If anyone happens to call while I am out of the office, please have ________ leave a message for me.
A、he
B、him
C、they
D、them
【正确答案】：B
【题目解析】：考查have做使役动词的用法，have sb do sth“让某人做”，其它的选项都接sb to do sth，句意是：如果我不在时有人来访，让他留个口信。选B。