They are going to have the serviceman an electric fan in the office tomorrow.A. installB.

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(答案→)A. install
B. to install
C. to be installed
D. installed
解析：在have sb. do sth.结构中 do sth.做宾语 the serviceman的补足语，和 serviceman构成了逻辑上的主语和谓语的关系，表示叫某人做某事。