LỜI GIẢI

question 18:

AT this time yesterday,while i ________  a book , my sister _______ to music

A, read/was listening

B was reading/was listening

C was reading/listened

D, read/listened

GIẢI THÍCH :

while( stong khi)+  AT this time yesterday (Lúc này vào hôm qua, + có giờ trong quá khứ) :------------------->>>> THÌ QUÁ KHỨ TIẾP DIỄN

18. B,  was reading/ was listening

, ta dung thi qua khu tiep dien , khi co diem thoi gian xac dinh trong qua khu : at this time yesterday

, ta dung thi qua khu tiep dien khi hai hoac nhieu hanh dong, su viec xay ra dong thoi tai mot thoi diem xac dinh trong qua khu.

At this time yesterday, while I was reading a book, my sister was listening to music.

Vao luc nay hom qua , trong khi toi dang doc sach, thi em/chi gai toi dang nghe nhac

, at this time yesterday : thoi diem xac dinh trong qua khu.

, chuc ban hoc tot nhe !