I was very busy lately since the project of designing the new collection started.

I was very busy lately since the project of designing the new collection started.

A. was

B. since

C. the project

D. the new collection
Xem đáp án
A là đáp án đúng
Lời giải:
was => have been
Hiện tai hoàn thành + since + quá khứ đơn.