Mark the letter A, B, C, or D on your answer sheet to show the underlinedpart that needs correction in each of the following questions.
In both of tundra and taiga, tracking (A) animals in summer is more differcult than it(B) is in winter when the (C) swampy ground is (D) frozenly solid and covers with snow.
A. animals
B. is
C. swampy ground
D. frozenly
Đáp án D