by What happened in New York were a reaction from city workers, including firemen and policemen who had been laid off from their jobs.
A. What happened
B. were
C. including
D. their
Xem đáp án
B là đáp án đúng
Lời giải:
were => was
Giải thích: chủ ngữ là mệnh đề danh ngữ “what + S + V ⇒ Động từ chia số ít
