He laughed so much that he set her ________ too.
A.laughedB.laughingC.laughD.to laugh在线课程B
解析：
set sb doing sth．使某人做起某事来或处于做某事的状态中；
set sb．to do sth．要某人做某事。句意：他笑得如此厉害以至于使她也笑了起来。