UNIT 1 TO UNIT 3I. HÃY CHỌN MỘT TỪ CÓ PHẦN GẠCH DƯỚI ĐƯỢC PHÁT ÂM KHÁC...

21. “I must write some letters now. ” my brother said.

A. My brother said he must write some letters now.

B. My brother said he had to write some letters now.

C. My brother said he had to write some letters then.

D. My brother said he must to write some letters then.