It is essential that Mary _______speak English. A. was able to B. is able to C. be able to D. must be able to
It is essential that Mary _______speak English.
A. was able to
B. is able to
C. be able to
D. must be able to
Đáp án đúng là: C
Giải thích: essential + that + S + (should) V
Dịch: Điều cần thiết là Mary phải nói được tiếng Anh.