Night-shift workers lead a strange life, working while the rest of us are sleeping, \_\_\_\_ while the rest of us are working.
Athen they sleep
Buntil they go to sleep
Cthen sleeping正確答案
Dafter which they sleep
答案與詳解
為什麼答案是 C
使用現在分詞 sleeping 與前方的 working 形成平行結構，then 表達時間先後順序，語意通順。
載入中…
