Sue brushes her teeth ______ she goes to bed. 蘇在上床睡覺前刷牙。 a. but b. because c. after d. before Explanation before是表達時間的連接詞。上床睡覺和刷牙在時間上有前後關係,先刷完牙才會上床睡覺,故按句意邏輯可知應選before「(刷牙)在(上床睡覺)之前」,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.