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

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】：have后面缺少宾语，能做宾语的只有him和them，由于前面的anyone可知后面只能填him。