What happened ______ your sister? Is she sick? 你的姊姊怎麼了?她生病了嗎? a. with b. in c. at d. to Explanation happen後面用介系詞to,happen to somebody表示「(某事)發生在某人身上」,在此句是詢問對方姊姊發生了什麼事,正確答案為D。 Chinese translation After leaving this page, need to use 1 more coin to play audio Sorry! You don't have enough coins.