delete methods for multichoice/singlechoice
delete methods for multichoice/singlechoice

kdmsnr/review,masawada/review,kmuto/review,kmuto/review,takahashim/review,takahashim/review,orangain/review,kuad9/review_study,krororo/review,murashitas/review,murashitas/review,krororo/review,kmuto/review,kuad9/review_study,krororo/review,masawada/review,orangain/review,suzuki/review,suzuki/review