Tìm lỗi sai và sửa lại
Mình cần giải thích vì đáp án thì có rồi.
Although a number of police officers was guarding the priceless treasures in the museum, the director
A B C
worried that someone would try to steal them.
D
Although a number of police officers was guarding the priceless treasures in the museum, the director worried that someone would try to steal them.
was → were
police officers số ngiều nên dùng were.
was => were
Vì : A number of + Nsố nhiều => V số nhiều
The number of => V số ít
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