Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.
He has been very interested in doing research on .................. since he was at high school.
A.A.
biology
B.B.
biological
C.C.
biologist
D.D.
biologically
Đáp án và lời giải
Đáp án:A
Lời giải:
Chỗ trống cần một danh từ