Thanks Joffm for your prompt reply. It works! Really appreciate your help!
Best wishes, Xueting

Good afternoon Joffm,A new question is can I make a new question where the options are the chosen answers in the multiple choice task above?For instance, as the following picture shows, option 2, 3, and 4 were chosen in the multiple choice task, then I will be faced with a question asking me to make a choice between option 2, 3, 4 and nothing.
 
Many thanks!Xueting

Hi,
it's the usual way, that is described here many times.
Between your "choice" question and this new "single" question insert a (hidden) "multiple" question (MHidden) with the seven options as subquestions.
And also a (hidden) question of type "equation" where you preset the subquestions in the "multiple" question according to the selections in the "choice" question.
{MHidden_1=if(M2_SQ001_SQ001==1,"Y","")}
{MHidden_2=if(M2_SQ001_SQ002==1,"Y","")}
{MHidden_3=if(M2_SQ001_SQ003==1,"Y","")}
{MHidden_4=if(M2_SQ001_SQ004==1,"Y","")}
{MHidden_5=if(M2_SQ001_SQ005==1,"Y","")}
{MHidden_6=if(M2_SQ001_SQ006==1,"Y","")}
{MHidden_7=if(M2_SQ001_SQ007==1,"Y","")}

You see, I coded the subquestions "1", "2", ...
And exactly these codes you have to use in the "single" question

Now you use "MHidden" as array filter for your "single" question.

Of course you will not display this "single" question if there was only one option selected.





 

Joffm

Thank you Joffm for your patience! It works. I failed to find a relevant answer maybe because of the incorrect keywords I used.
All in all, as a beginner, I feel so lucky to receive your prompt and detailed answers those days, you are a real life-saver! Thanks again for sharing your priceless knowledge, which has helped so many people.
Have a nice day:)
Xueting