I saw an accident while I my friend yesterday.

10/50

I saw an accident while I ________ my friend yesterday.

waited

had waited

was being waited

was waiting

Giải thích

D

“When” dùng để diễn tả 1 hành động đang xảy ra 1 hành động khác xen vào

Thì quá khứ tiếpdiễn .