Was it ______ his daughter with her work _____ the man spent the whole evening at home?A.to help, thatB.help, whenC.helping, thatD.helped, which
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C解析考查强调句型。It is...that是强调句型，有一般疑问和特殊疑问句形式，可以强调除谓语外的任何成分。句意“正是帮助他的女儿做作业，那个人才在家了一晚上吗？”spend time doing sth.“花时间做某事”。故选C。