CSS details would differ depending on the template used.
It looks like you are using the Limespired template so these styles added to the end of template.css will make a multiple-options with
question ID 11 followed by a short-text with
question ID 22 appear to be one.
#question11 .survey-question {
margin-bottom: 0;
border-bottom: 0 none;
}
#question11 .subquestions-list {
margin-bottom: 0;
}
#question22 .survey-question {
border-top: 0 none;
}
#question22 .survey-question-text,
#question22 .survey-question-answer {
float: left;
}
#question22 .survey-question-text {
margin: 0 0 0 10px;
font-weight: normal;
}
#question22 .survey-question-answer p {
margin: 0 0 10px 0;
}