D
敲门 know at the door 固定搭配
所以AC不对
主语I,单数,所以用was having
当有人敲门时,我正吃早饭.
选择 （ ）someone knocket____the door while I____ my breakfast A.on;had B.at;were harving C.on;am
选择 （ ）someone knocket____the door while I____ my breakfast A.on;had B.at;were harving C.on;am
C.on;am having D.at;was having
C.on;am having D.at;was having
英语人气：391 ℃时间：2020-03-28 11:58:25
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